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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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Amount due to policyholder. Includes, but is not limited to, unpaid policy dividend, retrospective refund, and undistributed earnings on participating business. Excludes future policy benefit and claim expense.

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