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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, 2025 | Mar. 31, 2024
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Insurance [Abstract] |  |
Expected future benefit and expense payments | $ 31,433 | $ 32,474
Expected future gross premiums | $ 5,089 | $ 5,270

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