Market Risk Benefits - Schedule of market risk benefits (Details) - USD ($) $ in Millions |
Sep. 30, 2026 |
Sep. 30, 2025 |
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| Market Risk Benefit [Line Items] | ||
| Asset | $ 2,348 | $ 2,466 |
| Liability | 7,223 | 7,021 |
| Net | 4,875 | 4,555 |
| Individual Retirement | ||
| Market Risk Benefit [Line Items] | ||
| Asset | 0 | 0 |
| Liability | 5,022 | 4,898 |
| Net | 5,022 | 4,898 |
| Group Retirement | ||
| Market Risk Benefit [Line Items] | ||
| Asset | 248 | 243 |
| Liability | 514 | 576 |
| Net | 266 | 333 |
| Corporate & Other | ||
| Market Risk Benefit [Line Items] | ||
| Asset | 2,100 | 2,223 |
| Liability | 1,687 | 1,547 |
| Net | $ (413) | $ (676) |
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- Definition Market Risk Benefit, Assets, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change No definition available.
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- Definition Market Risk Benefit, Liabilities, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change No definition available.
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- Definition Amount, after effect of reinsurance and cumulative increase (decrease) in instrument-specific credit risk, of contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- 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/disclosureRef
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