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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 | Jun. 30, 2024 | Jun. 30, 2023
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Accident and health insurance |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums, undiscounted | $ 5,703 | $ 5,020
Expected future gross premiums, discounted | 3,867 | 3,602
Expected future benefits and expenses, undiscounted | 3,854 | 3,350
Expected future benefits and expenses, discounted | 2,567 | 2,326
Traditional life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums, undiscounted | 1,042 | 696
Expected future gross premiums, discounted | 715 | 489
Expected future benefits and expenses, undiscounted | 1,456 | 1,008
Expected future benefits and expenses, discounted | $ 697 | $ 539

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