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Insurance Liabilities (Future Policy Benefits - Reconciliation) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Mar. 31, 2023
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Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Liability for Future Policy Benefit, before Reinsurance | $ 32,245 | $ 32,286
Liabilities reported in the preceding rollforward tables |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Liability for Future Policy Benefit, before Reinsurance | 20,286 | 20,119
Long-term care insurance (1) |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Liability for Future Policy Benefit, before Reinsurance | 5,375 | 5,763
ULSG liabilities, including liability for profits followed by losses |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Liability for Future Policy Benefit, before Reinsurance | 2,591 | 2,654
Participating whole life insurance (2) |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Liability for Future Policy Benefit, before Reinsurance | 3,128 | 2,986
Deferred profit liabilities |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Liability for Future Policy Benefit, before Reinsurance | 480 | 373
Other |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Liability for Future Policy Benefit, before Reinsurance | $ 385 | $ 391

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