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Other Insurance Liabilities and Separate Accounts - Undiscounted Expected Gross Premiums and Expected Future Benefit Payments (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Mar. 31, 2023
--- | --- | ---
Large Case Pensions |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future benefit payments | $ 3,213 | $ 3,463
Expected gross premiums | 0 | 0
Long-Term Care |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future benefit payments | 3,215 | 3,246
Expected gross premiums | $ 411 | $ 428

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