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Reserve for Future Policy Benefits and Contractholder Funds - Schedule of Undiscounted and Discounted Expected Gross Premiums and Expected Future Benefits and Expenses (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Mar. 31, 2024
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Accident and health insurance |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums, undiscounted | $ 6,039 | $ 5,580
Expected future gross premiums, discounted | 4,057 | 3,807
Expected future benefits and expenses, undiscounted | 4,325 | 3,754
Expected future benefits and expenses, discounted | 2,864 | 2,509
Traditional life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums, undiscounted | 1,127 | 1,002
Expected future gross premiums, discounted | 786 | 687
Expected future benefits and expenses, undiscounted | 1,475 | 1,399
Expected future benefits and expenses, discounted | $ 736 | $ 672

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