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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
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