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Future Policy Benefit Reserves - Undiscounted Expected Future Benefit and Expense Payments and Undiscounted Expected Future Gross Premiums (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Mar. 31, 2022
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Insurance [Abstract] |  |
Expected future benefit and expense payments | $ 33,759 | $ 33,674
Expected future gross premiums | $ 5,729 | $ 5,969

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