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Future Policy Benefits - Undiscounted Expected Gross Premiums and Expected Future Benefit Payments (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2022
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Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Expected future benefit payments, Undiscounted | $ 15,906 |  | $ 13,819 |
Expected future gross premiums, Undiscounted | 14,649 |  | 7,541 |
Expected future benefit payments, Discounted | 8,103 | $ 7,253 | 7,253 | $ 6,618
Expected future gross premiums, Discounted | 8,507 |  | 4,328 |
Annuity |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Expected future benefit payments, Undiscounted | 5,531 |  | 3,466 |
Expected future gross premiums, Undiscounted | 0 |  | 0 |
Expected future benefit payments, Discounted | 3,384 | 2,213 | 2,213 | 1,288
Expected future gross premiums, Discounted | 0 |  | 0 |
Life |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |
Expected future benefit payments, Undiscounted | 10,375 |  | 10,353 |
Expected future gross premiums, Undiscounted | 14,649 |  | 7,541 |
Expected future benefit payments, Discounted | 4,719 | $ 5,040 | 5,040 | $ 5,330
Expected future gross premiums, Discounted | $ 8,507 |  | $ 4,328 |

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