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Future Policy Benefits - Undiscounted Expected Gross Premiums and Expected Future Benefit Payments (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future benefit payments, undiscounted | $ 18,672 | $ 13,819
Expected future gross premiums, undiscounted | 5,669 | 7,541
Expected future benefit payments, discounted | 9,674 | 7,253
Expected future gross premiums, discounted | 3,356 | 4,328
Annuities |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future benefit payments, undiscounted | 9,853 | 3,466
Expected future gross premiums, undiscounted | 0 | 0
Expected future benefit payments, discounted | 5,505 | 2,213
Expected future gross premiums, discounted | 0 | 0
Life Insurance |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future benefit payments, undiscounted | 8,819 | 10,353
Expected future gross premiums, undiscounted | 5,669 | 7,541
Expected future benefit payments, discounted | 4,169 | 5,040
Expected future gross premiums, discounted | $ 3,356 | $ 4,328

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