Shareholder Report, Holdings (Details)
|
Apr. 30, 2026 |
| C000111485 [Member] | NVIDIA Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000111485 [Member] | Charles Schwab Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000111485 [Member] | Schneider Electric SE [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000111485 [Member] | Willis Towers Watson PLC [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.20%
|
| C000111485 [Member] | Medtronic PLC [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.10%
|
| C000111485 [Member] | Amazon com Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000111485 [Member] | Alphabet Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000111485 [Member] | Visa Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.30%
|
| C000111485 [Member] | Broadcom Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000111485 [Member] | Microsoft Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000111485 [Member] | Other Countries [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.80%
|
| C000111485 [Member] | JAPAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.10%
|
| C000111485 [Member] | FRANCE |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
10.20%
|
| C000111485 [Member] | SWITZERLAND |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.40%
|
| C000111485 [Member] | CANADA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.60%
|
| C000111485 [Member] | GERMANY |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.30%
|
| C000111485 [Member] | SPAIN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000111485 [Member] | UNITED STATES |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
57.90%
|
| C000111485 [Member] | TAIWAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.40%
|
| C000111485 [Member] | UNITED KINGDOM |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
9.30%
|
| C000111485 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.00%
|
| C000111485 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
99.00%
|
| C000006616 [Member] | NVIDIA Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006616 [Member] | Charles Schwab Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006616 [Member] | Schneider Electric SE [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006616 [Member] | Willis Towers Watson PLC [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.20%
|
| C000006616 [Member] | Medtronic PLC [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.10%
|
| C000006616 [Member] | Amazon com Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006616 [Member] | Alphabet Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006616 [Member] | Visa Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.30%
|
| C000006616 [Member] | Broadcom Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006616 [Member] | Microsoft Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006616 [Member] | Other Countries [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.80%
|
| C000006616 [Member] | JAPAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.10%
|
| C000006616 [Member] | FRANCE |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
10.20%
|
| C000006616 [Member] | SWITZERLAND |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.40%
|
| C000006616 [Member] | CANADA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.60%
|
| C000006616 [Member] | GERMANY |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.30%
|
| C000006616 [Member] | SPAIN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006616 [Member] | UNITED STATES |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
57.90%
|
| C000006616 [Member] | TAIWAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.40%
|
| C000006616 [Member] | UNITED KINGDOM |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
9.30%
|
| C000006616 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.00%
|
| C000006616 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
99.00%
|
| C000006624 [Member] | NVIDIA Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006624 [Member] | Charles Schwab Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006624 [Member] | Schneider Electric SE [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006624 [Member] | Willis Towers Watson PLC [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.20%
|
| C000006624 [Member] | Medtronic PLC [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.10%
|
| C000006624 [Member] | Amazon com Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006624 [Member] | Alphabet Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006624 [Member] | Visa Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.30%
|
| C000006624 [Member] | Broadcom Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006624 [Member] | Microsoft Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006624 [Member] | Other Countries [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.80%
|
| C000006624 [Member] | JAPAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.10%
|
| C000006624 [Member] | FRANCE |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
10.20%
|
| C000006624 [Member] | SWITZERLAND |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.40%
|
| C000006624 [Member] | CANADA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.60%
|
| C000006624 [Member] | GERMANY |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.30%
|
| C000006624 [Member] | SPAIN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006624 [Member] | UNITED STATES |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
57.90%
|
| C000006624 [Member] | TAIWAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.40%
|
| C000006624 [Member] | UNITED KINGDOM |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
9.30%
|
| C000006624 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.00%
|
| C000006624 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
99.00%
|
| C000006623 [Member] | NVIDIA Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006623 [Member] | Charles Schwab Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006623 [Member] | Schneider Electric SE [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006623 [Member] | Willis Towers Watson PLC [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.20%
|
| C000006623 [Member] | Medtronic PLC [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.10%
|
| C000006623 [Member] | Amazon com Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006623 [Member] | Alphabet Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006623 [Member] | Visa Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.30%
|
| C000006623 [Member] | Broadcom Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006623 [Member] | Microsoft Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006623 [Member] | Other Countries [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.80%
|
| C000006623 [Member] | JAPAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.10%
|
| C000006623 [Member] | FRANCE |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
10.20%
|
| C000006623 [Member] | SWITZERLAND |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.40%
|
| C000006623 [Member] | CANADA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.60%
|
| C000006623 [Member] | GERMANY |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.30%
|
| C000006623 [Member] | SPAIN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006623 [Member] | UNITED STATES |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
57.90%
|
| C000006623 [Member] | TAIWAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.40%
|
| C000006623 [Member] | UNITED KINGDOM |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
9.30%
|
| C000006623 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.00%
|
| C000006623 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
99.00%
|
| C000006618 [Member] | NVIDIA Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006618 [Member] | Charles Schwab Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006618 [Member] | Schneider Electric SE [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006618 [Member] | Willis Towers Watson PLC [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.20%
|
| C000006618 [Member] | Medtronic PLC [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.10%
|
| C000006618 [Member] | Amazon com Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006618 [Member] | Alphabet Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006618 [Member] | Visa Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.30%
|
| C000006618 [Member] | Broadcom Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006618 [Member] | Microsoft Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006618 [Member] | Other Countries [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.80%
|
| C000006618 [Member] | JAPAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.10%
|
| C000006618 [Member] | FRANCE |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
10.20%
|
| C000006618 [Member] | SWITZERLAND |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.40%
|
| C000006618 [Member] | CANADA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.60%
|
| C000006618 [Member] | GERMANY |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.30%
|
| C000006618 [Member] | SPAIN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006618 [Member] | UNITED STATES |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
57.90%
|
| C000006618 [Member] | TAIWAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.40%
|
| C000006618 [Member] | UNITED KINGDOM |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
9.30%
|
| C000006618 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.00%
|
| C000006618 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
99.00%
|
| C000006617 [Member] | NVIDIA Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006617 [Member] | Charles Schwab Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006617 [Member] | Schneider Electric SE [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006617 [Member] | Willis Towers Watson PLC [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.20%
|
| C000006617 [Member] | Medtronic PLC [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.10%
|
| C000006617 [Member] | Amazon com Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006617 [Member] | Alphabet Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006617 [Member] | Visa Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.30%
|
| C000006617 [Member] | Broadcom Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006617 [Member] | Microsoft Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006617 [Member] | Other Countries [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.80%
|
| C000006617 [Member] | JAPAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.10%
|
| C000006617 [Member] | FRANCE |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
10.20%
|
| C000006617 [Member] | SWITZERLAND |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.40%
|
| C000006617 [Member] | CANADA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.60%
|
| C000006617 [Member] | GERMANY |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.30%
|
| C000006617 [Member] | SPAIN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006617 [Member] | UNITED STATES |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
57.90%
|
| C000006617 [Member] | TAIWAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.40%
|
| C000006617 [Member] | UNITED KINGDOM |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
9.30%
|
| C000006617 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.00%
|
| C000006617 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
99.00%
|
| C000006619 [Member] | NVIDIA Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006619 [Member] | Charles Schwab Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006619 [Member] | Schneider Electric SE [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006619 [Member] | Willis Towers Watson PLC [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.20%
|
| C000006619 [Member] | Medtronic PLC [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.10%
|
| C000006619 [Member] | Amazon com Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006619 [Member] | Alphabet Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006619 [Member] | Visa Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.30%
|
| C000006619 [Member] | Broadcom Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006619 [Member] | Microsoft Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006619 [Member] | Other Countries [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.80%
|
| C000006619 [Member] | JAPAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.10%
|
| C000006619 [Member] | FRANCE |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
10.20%
|
| C000006619 [Member] | SWITZERLAND |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.40%
|
| C000006619 [Member] | CANADA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.60%
|
| C000006619 [Member] | GERMANY |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.30%
|
| C000006619 [Member] | SPAIN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006619 [Member] | UNITED STATES |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
57.90%
|
| C000006619 [Member] | TAIWAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.40%
|
| C000006619 [Member] | UNITED KINGDOM |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
9.30%
|
| C000006619 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.00%
|
| C000006619 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
99.00%
|
| C000006621 [Member] | NVIDIA Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006621 [Member] | Charles Schwab Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006621 [Member] | Schneider Electric SE [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006621 [Member] | Willis Towers Watson PLC [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.20%
|
| C000006621 [Member] | Medtronic PLC [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.10%
|
| C000006621 [Member] | Amazon com Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006621 [Member] | Alphabet Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006621 [Member] | Visa Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.30%
|
| C000006621 [Member] | Broadcom Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006621 [Member] | Microsoft Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006621 [Member] | Other Countries [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.80%
|
| C000006621 [Member] | JAPAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.10%
|
| C000006621 [Member] | FRANCE |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
10.20%
|
| C000006621 [Member] | SWITZERLAND |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.40%
|
| C000006621 [Member] | CANADA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.60%
|
| C000006621 [Member] | GERMANY |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.30%
|
| C000006621 [Member] | SPAIN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006621 [Member] | UNITED STATES |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
57.90%
|
| C000006621 [Member] | TAIWAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.40%
|
| C000006621 [Member] | UNITED KINGDOM |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
9.30%
|
| C000006621 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.00%
|
| C000006621 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
99.00%
|
| C000006615 [Member] | NVIDIA Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006615 [Member] | Charles Schwab Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006615 [Member] | Schneider Electric SE [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006615 [Member] | Willis Towers Watson PLC [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.20%
|
| C000006615 [Member] | Medtronic PLC [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.10%
|
| C000006615 [Member] | Amazon com Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006615 [Member] | Alphabet Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006615 [Member] | Visa Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.30%
|
| C000006615 [Member] | Broadcom Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006615 [Member] | Microsoft Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006615 [Member] | Other Countries [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.80%
|
| C000006615 [Member] | JAPAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.10%
|
| C000006615 [Member] | FRANCE |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
10.20%
|
| C000006615 [Member] | SWITZERLAND |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.40%
|
| C000006615 [Member] | CANADA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.60%
|
| C000006615 [Member] | GERMANY |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.30%
|
| C000006615 [Member] | SPAIN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006615 [Member] | UNITED STATES |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
57.90%
|
| C000006615 [Member] | TAIWAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.40%
|
| C000006615 [Member] | UNITED KINGDOM |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
9.30%
|
| C000006615 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.00%
|
| C000006615 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
99.00%
|
| C000006625 [Member] | Other Countries [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
13.90%
|
| C000006625 [Member] | Fitch, AA Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.70%
|
| C000006625 [Member] | Fitch, A Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
11.10%
|
| C000006625 [Member] | Fitch, BBB Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
8.90%
|
| C000006625 [Member] | Fitch, D Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.00%
|
| C000006625 [Member] | Not Rated [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.40%
|
| C000006625 [Member] | Moody's, Aaa Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.30%
|
| C000006625 [Member] | Money Market Funds Quality [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.20%
|
| C000006625 [Member] | Energy Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.40%
|
| C000006625 [Member] | Financial Services Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
13.50%
|
| C000006625 [Member] | Healthcare Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
8.60%
|
| C000006625 [Member] | Real Estate Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.30%
|
| C000006625 [Member] | Communications Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.70%
|
| C000006625 [Member] | Consumer Discretionary Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.10%
|
| C000006625 [Member] | Consumer Staples Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
7.40%
|
| C000006625 [Member] | Industrial Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
7.40%
|
| C000006625 [Member] | Information Technology Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.90%
|
| C000006625 [Member] | Materials Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.60%
|
| C000006625 [Member] | Utilities Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.30%
|
| C000006625 [Member] | KOREA, REPUBLIC OF |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006625 [Member] | ITALY |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006625 [Member] | JAPAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.90%
|
| C000006625 [Member] | CHINA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.30%
|
| C000006625 [Member] | FRANCE |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.70%
|
| C000006625 [Member] | SWITZERLAND |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006625 [Member] | CANADA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.50%
|
| C000006625 [Member] | UNITED STATES |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
47.70%
|
| C000006625 [Member] | UNITED KINGDOM |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
9.50%
|
| C000006625 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.20%
|
| C000006625 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
60.20%
|
| C000006625 [Member] | Federal Agencies [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.60%
|
| C000006625 [Member] | US Government Debt Securities [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.60%
|
| C000006625 [Member] | Non Fixed Income [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
60.20%
|
| C000006625 [Member] | Fixed Income Securities [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
36.60%
|
| C000006627 [Member] | Other Countries [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
13.90%
|
| C000006627 [Member] | Fitch, AA Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.70%
|
| C000006627 [Member] | Fitch, A Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
11.10%
|
| C000006627 [Member] | Fitch, BBB Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
8.90%
|
| C000006627 [Member] | Fitch, D Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.00%
|
| C000006627 [Member] | Not Rated [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.40%
|
| C000006627 [Member] | Moody's, Aaa Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.30%
|
| C000006627 [Member] | Money Market Funds Quality [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.20%
|
| C000006627 [Member] | Energy Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.40%
|
| C000006627 [Member] | Financial Services Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
13.50%
|
| C000006627 [Member] | Healthcare Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
8.60%
|
| C000006627 [Member] | Real Estate Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.30%
|
| C000006627 [Member] | Communications Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.70%
|
| C000006627 [Member] | Consumer Discretionary Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.10%
|
| C000006627 [Member] | Consumer Staples Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
7.40%
|
| C000006627 [Member] | Industrial Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
7.40%
|
| C000006627 [Member] | Information Technology Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.90%
|
| C000006627 [Member] | Materials Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.60%
|
| C000006627 [Member] | Utilities Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.30%
|
| C000006627 [Member] | KOREA, REPUBLIC OF |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006627 [Member] | ITALY |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006627 [Member] | JAPAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.90%
|
| C000006627 [Member] | CHINA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.30%
|
| C000006627 [Member] | FRANCE |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.70%
|
| C000006627 [Member] | SWITZERLAND |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006627 [Member] | CANADA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.50%
|
| C000006627 [Member] | UNITED STATES |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
47.70%
|
| C000006627 [Member] | UNITED KINGDOM |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
9.50%
|
| C000006627 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.20%
|
| C000006627 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
60.20%
|
| C000006627 [Member] | Federal Agencies [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.60%
|
| C000006627 [Member] | US Government Debt Securities [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.60%
|
| C000006627 [Member] | Non Fixed Income [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
60.20%
|
| C000006627 [Member] | Fixed Income Securities [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
36.60%
|
| C000006628 [Member] | Other Countries [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
13.90%
|
| C000006628 [Member] | Fitch, AA Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.70%
|
| C000006628 [Member] | Fitch, A Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
11.10%
|
| C000006628 [Member] | Fitch, BBB Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
8.90%
|
| C000006628 [Member] | Fitch, D Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.00%
|
| C000006628 [Member] | Not Rated [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.40%
|
| C000006628 [Member] | Moody's, Aaa Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.30%
|
| C000006628 [Member] | Money Market Funds Quality [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.20%
|
| C000006628 [Member] | Energy Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.40%
|
| C000006628 [Member] | Financial Services Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
13.50%
|
| C000006628 [Member] | Healthcare Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
8.60%
|
| C000006628 [Member] | Real Estate Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.30%
|
| C000006628 [Member] | Communications Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.70%
|
| C000006628 [Member] | Consumer Discretionary Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.10%
|
| C000006628 [Member] | Consumer Staples Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
7.40%
|
| C000006628 [Member] | Industrial Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
7.40%
|
| C000006628 [Member] | Information Technology Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.90%
|
| C000006628 [Member] | Materials Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.60%
|
| C000006628 [Member] | Utilities Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.30%
|
| C000006628 [Member] | KOREA, REPUBLIC OF |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006628 [Member] | ITALY |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006628 [Member] | JAPAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.90%
|
| C000006628 [Member] | CHINA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.30%
|
| C000006628 [Member] | FRANCE |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.70%
|
| C000006628 [Member] | SWITZERLAND |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006628 [Member] | CANADA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.50%
|
| C000006628 [Member] | UNITED STATES |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
47.70%
|
| C000006628 [Member] | UNITED KINGDOM |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
9.50%
|
| C000006628 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.20%
|
| C000006628 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
60.20%
|
| C000006628 [Member] | Federal Agencies [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.60%
|
| C000006628 [Member] | US Government Debt Securities [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.60%
|
| C000006628 [Member] | Non Fixed Income [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
60.20%
|
| C000006628 [Member] | Fixed Income Securities [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
36.60%
|
| C000006629 [Member] | Other Countries [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
13.90%
|
| C000006629 [Member] | Fitch, AA Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.70%
|
| C000006629 [Member] | Fitch, A Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
11.10%
|
| C000006629 [Member] | Fitch, BBB Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
8.90%
|
| C000006629 [Member] | Fitch, D Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.00%
|
| C000006629 [Member] | Not Rated [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.40%
|
| C000006629 [Member] | Moody's, Aaa Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.30%
|
| C000006629 [Member] | Money Market Funds Quality [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.20%
|
| C000006629 [Member] | Energy Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.40%
|
| C000006629 [Member] | Financial Services Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
13.50%
|
| C000006629 [Member] | Healthcare Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
8.60%
|
| C000006629 [Member] | Real Estate Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.30%
|
| C000006629 [Member] | Communications Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.70%
|
| C000006629 [Member] | Consumer Discretionary Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.10%
|
| C000006629 [Member] | Consumer Staples Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
7.40%
|
| C000006629 [Member] | Industrial Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
7.40%
|
| C000006629 [Member] | Information Technology Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.90%
|
| C000006629 [Member] | Materials Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.60%
|
| C000006629 [Member] | Utilities Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.30%
|
| C000006629 [Member] | KOREA, REPUBLIC OF |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006629 [Member] | ITALY |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006629 [Member] | JAPAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.90%
|
| C000006629 [Member] | CHINA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.30%
|
| C000006629 [Member] | FRANCE |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.70%
|
| C000006629 [Member] | SWITZERLAND |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006629 [Member] | CANADA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.50%
|
| C000006629 [Member] | UNITED STATES |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
47.70%
|
| C000006629 [Member] | UNITED KINGDOM |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
9.50%
|
| C000006629 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.20%
|
| C000006629 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
60.20%
|
| C000006629 [Member] | Federal Agencies [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.60%
|
| C000006629 [Member] | US Government Debt Securities [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.60%
|
| C000006629 [Member] | Non Fixed Income [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
60.20%
|
| C000006629 [Member] | Fixed Income Securities [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
36.60%
|
| C000006631 [Member] | Other Countries [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
13.90%
|
| C000006631 [Member] | Fitch, AA Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.70%
|
| C000006631 [Member] | Fitch, A Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
11.10%
|
| C000006631 [Member] | Fitch, BBB Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
8.90%
|
| C000006631 [Member] | Fitch, D Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.00%
|
| C000006631 [Member] | Not Rated [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.40%
|
| C000006631 [Member] | Moody's, Aaa Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.30%
|
| C000006631 [Member] | Money Market Funds Quality [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.20%
|
| C000006631 [Member] | Energy Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.40%
|
| C000006631 [Member] | Financial Services Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
13.50%
|
| C000006631 [Member] | Healthcare Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
8.60%
|
| C000006631 [Member] | Real Estate Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.30%
|
| C000006631 [Member] | Communications Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.70%
|
| C000006631 [Member] | Consumer Discretionary Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.10%
|
| C000006631 [Member] | Consumer Staples Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
7.40%
|
| C000006631 [Member] | Industrial Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
7.40%
|
| C000006631 [Member] | Information Technology Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.90%
|
| C000006631 [Member] | Materials Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.60%
|
| C000006631 [Member] | Utilities Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.30%
|
| C000006631 [Member] | KOREA, REPUBLIC OF |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006631 [Member] | ITALY |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006631 [Member] | JAPAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.90%
|
| C000006631 [Member] | CHINA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.30%
|
| C000006631 [Member] | FRANCE |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.70%
|
| C000006631 [Member] | SWITZERLAND |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006631 [Member] | CANADA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.50%
|
| C000006631 [Member] | UNITED STATES |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
47.70%
|
| C000006631 [Member] | UNITED KINGDOM |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
9.50%
|
| C000006631 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.20%
|
| C000006631 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
60.20%
|
| C000006631 [Member] | Federal Agencies [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.60%
|
| C000006631 [Member] | US Government Debt Securities [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.60%
|
| C000006631 [Member] | Non Fixed Income [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
60.20%
|
| C000006631 [Member] | Fixed Income Securities [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
36.60%
|
| C000006633 [Member] | Other Countries [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
13.90%
|
| C000006633 [Member] | Fitch, AA Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.70%
|
| C000006633 [Member] | Fitch, A Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
11.10%
|
| C000006633 [Member] | Fitch, BBB Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
8.90%
|
| C000006633 [Member] | Fitch, D Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.00%
|
| C000006633 [Member] | Not Rated [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.40%
|
| C000006633 [Member] | Moody's, Aaa Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.30%
|
| C000006633 [Member] | Money Market Funds Quality [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.20%
|
| C000006633 [Member] | Energy Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.40%
|
| C000006633 [Member] | Financial Services Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
13.50%
|
| C000006633 [Member] | Healthcare Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
8.60%
|
| C000006633 [Member] | Real Estate Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.30%
|
| C000006633 [Member] | Communications Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.70%
|
| C000006633 [Member] | Consumer Discretionary Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.10%
|
| C000006633 [Member] | Consumer Staples Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
7.40%
|
| C000006633 [Member] | Industrial Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
7.40%
|
| C000006633 [Member] | Information Technology Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.90%
|
| C000006633 [Member] | Materials Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.60%
|
| C000006633 [Member] | Utilities Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.30%
|
| C000006633 [Member] | KOREA, REPUBLIC OF |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006633 [Member] | ITALY |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006633 [Member] | JAPAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.90%
|
| C000006633 [Member] | CHINA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.30%
|
| C000006633 [Member] | FRANCE |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.70%
|
| C000006633 [Member] | SWITZERLAND |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006633 [Member] | CANADA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.50%
|
| C000006633 [Member] | UNITED STATES |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
47.70%
|
| C000006633 [Member] | UNITED KINGDOM |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
9.50%
|
| C000006633 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.20%
|
| C000006633 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
60.20%
|
| C000006633 [Member] | Federal Agencies [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.60%
|
| C000006633 [Member] | US Government Debt Securities [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.60%
|
| C000006633 [Member] | Non Fixed Income [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
60.20%
|
| C000006633 [Member] | Fixed Income Securities [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
36.60%
|
| C000006634 [Member] | Other Countries [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
13.90%
|
| C000006634 [Member] | Fitch, AA Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.70%
|
| C000006634 [Member] | Fitch, A Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
11.10%
|
| C000006634 [Member] | Fitch, BBB Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
8.90%
|
| C000006634 [Member] | Fitch, D Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.00%
|
| C000006634 [Member] | Not Rated [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.40%
|
| C000006634 [Member] | Moody's, Aaa Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.30%
|
| C000006634 [Member] | Money Market Funds Quality [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.20%
|
| C000006634 [Member] | Energy Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.40%
|
| C000006634 [Member] | Financial Services Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
13.50%
|
| C000006634 [Member] | Healthcare Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
8.60%
|
| C000006634 [Member] | Real Estate Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.30%
|
| C000006634 [Member] | Communications Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.70%
|
| C000006634 [Member] | Consumer Discretionary Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.10%
|
| C000006634 [Member] | Consumer Staples Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
7.40%
|
| C000006634 [Member] | Industrial Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
7.40%
|
| C000006634 [Member] | Information Technology Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.90%
|
| C000006634 [Member] | Materials Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.60%
|
| C000006634 [Member] | Utilities Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.30%
|
| C000006634 [Member] | KOREA, REPUBLIC OF |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006634 [Member] | ITALY |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006634 [Member] | JAPAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.90%
|
| C000006634 [Member] | CHINA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.30%
|
| C000006634 [Member] | FRANCE |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.70%
|
| C000006634 [Member] | SWITZERLAND |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006634 [Member] | CANADA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.50%
|
| C000006634 [Member] | UNITED STATES |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
47.70%
|
| C000006634 [Member] | UNITED KINGDOM |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
9.50%
|
| C000006634 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.20%
|
| C000006634 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
60.20%
|
| C000006634 [Member] | Federal Agencies [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.60%
|
| C000006634 [Member] | US Government Debt Securities [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.60%
|
| C000006634 [Member] | Non Fixed Income [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
60.20%
|
| C000006634 [Member] | Fixed Income Securities [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
36.60%
|
| C000006626 [Member] | Other Countries [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
13.90%
|
| C000006626 [Member] | Fitch, AA Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.70%
|
| C000006626 [Member] | Fitch, A Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
11.10%
|
| C000006626 [Member] | Fitch, BBB Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
8.90%
|
| C000006626 [Member] | Fitch, D Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.00%
|
| C000006626 [Member] | Not Rated [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.40%
|
| C000006626 [Member] | Moody's, Aaa Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.30%
|
| C000006626 [Member] | Money Market Funds Quality [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.20%
|
| C000006626 [Member] | Energy Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.40%
|
| C000006626 [Member] | Financial Services Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
13.50%
|
| C000006626 [Member] | Healthcare Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
8.60%
|
| C000006626 [Member] | Real Estate Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.30%
|
| C000006626 [Member] | Communications Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.70%
|
| C000006626 [Member] | Consumer Discretionary Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.10%
|
| C000006626 [Member] | Consumer Staples Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
7.40%
|
| C000006626 [Member] | Industrial Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
7.40%
|
| C000006626 [Member] | Information Technology Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.90%
|
| C000006626 [Member] | Materials Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.60%
|
| C000006626 [Member] | Utilities Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.30%
|
| C000006626 [Member] | KOREA, REPUBLIC OF |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006626 [Member] | ITALY |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006626 [Member] | JAPAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.90%
|
| C000006626 [Member] | CHINA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.30%
|
| C000006626 [Member] | FRANCE |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.70%
|
| C000006626 [Member] | SWITZERLAND |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000006626 [Member] | CANADA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.50%
|
| C000006626 [Member] | UNITED STATES |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
47.70%
|
| C000006626 [Member] | UNITED KINGDOM |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
9.50%
|
| C000006626 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.20%
|
| C000006626 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
60.20%
|
| C000006626 [Member] | Federal Agencies [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.60%
|
| C000006626 [Member] | US Government Debt Securities [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.60%
|
| C000006626 [Member] | Non Fixed Income [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
60.20%
|
| C000006626 [Member] | Fixed Income Securities [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
36.60%
|
| C000111486 [Member] | Other Countries [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
13.90%
|
| C000111486 [Member] | Fitch, AA Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.70%
|
| C000111486 [Member] | Fitch, A Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
11.10%
|
| C000111486 [Member] | Fitch, BBB Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
8.90%
|
| C000111486 [Member] | Fitch, D Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.00%
|
| C000111486 [Member] | Not Rated [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.40%
|
| C000111486 [Member] | Moody's, Aaa Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.30%
|
| C000111486 [Member] | Money Market Funds Quality [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.20%
|
| C000111486 [Member] | Energy Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.40%
|
| C000111486 [Member] | Financial Services Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
13.50%
|
| C000111486 [Member] | Healthcare Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
8.60%
|
| C000111486 [Member] | Real Estate Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.30%
|
| C000111486 [Member] | Communications Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.70%
|
| C000111486 [Member] | Consumer Discretionary Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.10%
|
| C000111486 [Member] | Consumer Staples Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
7.40%
|
| C000111486 [Member] | Industrial Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
7.40%
|
| C000111486 [Member] | Information Technology Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.90%
|
| C000111486 [Member] | Materials Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.60%
|
| C000111486 [Member] | Utilities Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.30%
|
| C000111486 [Member] | KOREA, REPUBLIC OF |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000111486 [Member] | ITALY |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000111486 [Member] | JAPAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.90%
|
| C000111486 [Member] | CHINA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.30%
|
| C000111486 [Member] | FRANCE |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.70%
|
| C000111486 [Member] | SWITZERLAND |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.00%
|
| C000111486 [Member] | CANADA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.50%
|
| C000111486 [Member] | UNITED STATES |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
47.70%
|
| C000111486 [Member] | UNITED KINGDOM |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
9.50%
|
| C000111486 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.20%
|
| C000111486 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
60.20%
|
| C000111486 [Member] | Federal Agencies [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.60%
|
| C000111486 [Member] | US Government Debt Securities [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.60%
|
| C000111486 [Member] | Non Fixed Income [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
60.20%
|
| C000111486 [Member] | Fixed Income Securities [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
36.60%
|
| C000070410 [Member] | NextEra Energy Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
13.30%
|
| C000070410 [Member] | Constellation Energy [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
7.00%
|
| C000070410 [Member] | PG And E Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.60%
|
| C000070410 [Member] | Xcel Energy Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.40%
|
| C000070410 [Member] | American Electric Power Co Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.90%
|
| C000070410 [Member] | DTE Energy Co [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.10%
|
| C000070410 [Member] | Ameren Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.80%
|
| C000070410 [Member] | Dominion Energy Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.80%
|
| C000070410 [Member] | Southern Co [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.70%
|
| C000070410 [Member] | Sempra [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.90%
|
| C000070410 [Member] | Utilities Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
98.10%
|
| C000070410 [Member] | Energy Renewables [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.90%
|
| C000070410 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.80%
|
| C000070410 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
99.20%
|
| C000006636 [Member] | NextEra Energy Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
13.30%
|
| C000006636 [Member] | Constellation Energy [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
7.00%
|
| C000006636 [Member] | PG And E Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.60%
|
| C000006636 [Member] | Xcel Energy Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.40%
|
| C000006636 [Member] | American Electric Power Co Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.90%
|
| C000006636 [Member] | DTE Energy Co [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.10%
|
| C000006636 [Member] | Ameren Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.80%
|
| C000006636 [Member] | Dominion Energy Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.80%
|
| C000006636 [Member] | Southern Co [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.70%
|
| C000006636 [Member] | Sempra [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.90%
|
| C000006636 [Member] | Utilities Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
98.10%
|
| C000006636 [Member] | Energy Renewables [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.90%
|
| C000006636 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.80%
|
| C000006636 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
99.20%
|
| C000006644 [Member] | NextEra Energy Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
13.30%
|
| C000006644 [Member] | Constellation Energy [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
7.00%
|
| C000006644 [Member] | PG And E Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.60%
|
| C000006644 [Member] | Xcel Energy Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.40%
|
| C000006644 [Member] | American Electric Power Co Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.90%
|
| C000006644 [Member] | DTE Energy Co [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.10%
|
| C000006644 [Member] | Ameren Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.80%
|
| C000006644 [Member] | Dominion Energy Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.80%
|
| C000006644 [Member] | Southern Co [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.70%
|
| C000006644 [Member] | Sempra [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.90%
|
| C000006644 [Member] | Utilities Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
98.10%
|
| C000006644 [Member] | Energy Renewables [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.90%
|
| C000006644 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.80%
|
| C000006644 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
99.20%
|
| C000006643 [Member] | NextEra Energy Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
13.30%
|
| C000006643 [Member] | Constellation Energy [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
7.00%
|
| C000006643 [Member] | PG And E Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.60%
|
| C000006643 [Member] | Xcel Energy Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.40%
|
| C000006643 [Member] | American Electric Power Co Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.90%
|
| C000006643 [Member] | DTE Energy Co [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.10%
|
| C000006643 [Member] | Ameren Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.80%
|
| C000006643 [Member] | Dominion Energy Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.80%
|
| C000006643 [Member] | Southern Co [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.70%
|
| C000006643 [Member] | Sempra [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.90%
|
| C000006643 [Member] | Utilities Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
98.10%
|
| C000006643 [Member] | Energy Renewables [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.90%
|
| C000006643 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.80%
|
| C000006643 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
99.20%
|
| C000006639 [Member] | NextEra Energy Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
13.30%
|
| C000006639 [Member] | Constellation Energy [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
7.00%
|
| C000006639 [Member] | PG And E Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.60%
|
| C000006639 [Member] | Xcel Energy Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.40%
|
| C000006639 [Member] | American Electric Power Co Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.90%
|
| C000006639 [Member] | DTE Energy Co [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.10%
|
| C000006639 [Member] | Ameren Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.80%
|
| C000006639 [Member] | Dominion Energy Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.80%
|
| C000006639 [Member] | Southern Co [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.70%
|
| C000006639 [Member] | Sempra [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.90%
|
| C000006639 [Member] | Utilities Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
98.10%
|
| C000006639 [Member] | Energy Renewables [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.90%
|
| C000006639 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.80%
|
| C000006639 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
99.20%
|
| C000006638 [Member] | NextEra Energy Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
13.30%
|
| C000006638 [Member] | Constellation Energy [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
7.00%
|
| C000006638 [Member] | PG And E Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.60%
|
| C000006638 [Member] | Xcel Energy Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.40%
|
| C000006638 [Member] | American Electric Power Co Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.90%
|
| C000006638 [Member] | DTE Energy Co [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.10%
|
| C000006638 [Member] | Ameren Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.80%
|
| C000006638 [Member] | Dominion Energy Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.80%
|
| C000006638 [Member] | Southern Co [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.70%
|
| C000006638 [Member] | Sempra [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.90%
|
| C000006638 [Member] | Utilities Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
98.10%
|
| C000006638 [Member] | Energy Renewables [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.90%
|
| C000006638 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.80%
|
| C000006638 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
99.20%
|
| C000006641 [Member] | NextEra Energy Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
13.30%
|
| C000006641 [Member] | Constellation Energy [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
7.00%
|
| C000006641 [Member] | PG And E Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.60%
|
| C000006641 [Member] | Xcel Energy Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.40%
|
| C000006641 [Member] | American Electric Power Co Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.90%
|
| C000006641 [Member] | DTE Energy Co [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.10%
|
| C000006641 [Member] | Ameren Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.80%
|
| C000006641 [Member] | Dominion Energy Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.80%
|
| C000006641 [Member] | Southern Co [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.70%
|
| C000006641 [Member] | Sempra [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.90%
|
| C000006641 [Member] | Utilities Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
98.10%
|
| C000006641 [Member] | Energy Renewables [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.90%
|
| C000006641 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.80%
|
| C000006641 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
99.20%
|
| C000006637 [Member] | NextEra Energy Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
13.30%
|
| C000006637 [Member] | Constellation Energy [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
7.00%
|
| C000006637 [Member] | PG And E Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.60%
|
| C000006637 [Member] | Xcel Energy Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.40%
|
| C000006637 [Member] | American Electric Power Co Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.90%
|
| C000006637 [Member] | DTE Energy Co [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.10%
|
| C000006637 [Member] | Ameren Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.80%
|
| C000006637 [Member] | Dominion Energy Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.80%
|
| C000006637 [Member] | Southern Co [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.70%
|
| C000006637 [Member] | Sempra [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.90%
|
| C000006637 [Member] | Utilities Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
98.10%
|
| C000006637 [Member] | Energy Renewables [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.90%
|
| C000006637 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.80%
|
| C000006637 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
99.20%
|
| C000006635 [Member] | NextEra Energy Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
13.30%
|
| C000006635 [Member] | Constellation Energy [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
7.00%
|
| C000006635 [Member] | PG And E Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.60%
|
| C000006635 [Member] | Xcel Energy Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.40%
|
| C000006635 [Member] | American Electric Power Co Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.90%
|
| C000006635 [Member] | DTE Energy Co [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.10%
|
| C000006635 [Member] | Ameren Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.80%
|
| C000006635 [Member] | Dominion Energy Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.80%
|
| C000006635 [Member] | Southern Co [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.70%
|
| C000006635 [Member] | Sempra [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.90%
|
| C000006635 [Member] | Utilities Sector [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
98.10%
|
| C000006635 [Member] | Energy Renewables [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.90%
|
| C000006635 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.80%
|
| C000006635 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
99.20%
|