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Insurance Liabilities (Reconciliation of Policyholder Account Balances) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Mar. 31, 2023
--- | --- | ---
Policyholder Account Balance [Line Items] |  |
Policyholder Account Balance | $ 84,159 | $ 76,120
Rollforwards Total |  |
Policyholder Account Balance [Line Items] |  |
Policyholder Account Balance | 71,844 | 63,831
Funding agreements classified as investment contracts |  |
Policyholder Account Balance [Line Items] |  |
Policyholder Account Balance | 11,245 | 11,151
Other investment contract liabilities |  |
Policyholder Account Balance [Line Items] |  |
Policyholder Account Balance | $ 1,070 | $ 1,138

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