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Insurance (Reconciliation of Policyholder Account Balances) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Mar. 31, 2022
--- | --- | ---
Policyholder Account Balance [Line Items] |  |
Policyholder Account Balance | $ 76,120 | $ 66,711
Rollforwards Total |  |
Policyholder Account Balance [Line Items] |  |
Policyholder Account Balance | 63,831 | 57,707
Funding agreements classified as investment contracts |  |
Policyholder Account Balance [Line Items] |  |
Policyholder Account Balance | 11,151 | 7,705
Other investment contract liabilities |  |
Policyholder Account Balance [Line Items] |  |
Policyholder Account Balance | $ 1,138 | $ 1,299

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