FAIR VALUE, Investments in Private Equity Measured at Net Asset Value Per Share (Details) - Recurring - USD ($) $ in Millions |
Mar. 31, 2026 |
Sep. 30, 2025 |
|---|---|---|
| Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] | ||
| Private equity investments measured at NAV, recorded value | $ 111 | $ 105 |
| Private equity investments not measured at NAV, recorded value | 7 | 7 |
| Total private equity investments | 118 | 112 |
| Parent | ||
| Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] | ||
| Private equity investments measured at NAV, unfunded commitment | $ 36 | $ 38 |
| X | ||||||||||
- Definition Investments, Excluding Net Asset Value, Fair Value Disclosure No definition available.
|
| X | ||||||||||
- Definition Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition The fair value as of the balance sheet date of firm holdings in private equity, mezzanine, venture capital, merchant banking, real estate and special situations investments. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|