S000013702 [Member] Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended | 226 Months Ended |
|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
|
| Bloomberg U.S. Universal Index (Returns do not reflect deductions for fees, expenses or taxes) | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 7.58% | 0.06% | 2.44% | |
| Bloomberg U.S. MBS Index (Returns do not reflect deductions for fees, expenses or taxes) | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 8.58% | 0.15% | 1.59% | |
| iShares MBS ETF | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 8.45% | 0.08% | 1.49% | |
| Performance Inception Date | Mar. 13, 2007 | |||
| iShares MBS ETF | After Taxes on Distributions | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 6.58% | (1.12%) | 0.38% | |
| iShares MBS ETF | After Taxes on Distributions and Sales | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 4.96% | (0.46%) | 0.65% |