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Market Risk Benefits - Balances of and Changes in Market Risk Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Market Risk Benefit [Roll Forward]      
Beginning balance $ 335 $ 1,103 $ 2,901
Issuances 24 17 27
Interest accrual and time decay (66) (53) (237)
Reserve increase from attributed fees collected 790 788 810
Reserve release for benefit payments and derecognition (11) (35) (29)
Effect of changes in interest rates and bond markets (1,078) (367) (4,193)
Effect of changes in equity markets and subaccount performance (1,228) (1,267) 2,258
Effect of changes in equity index volatility 59 (67) 205
Actual policyholder behavior different from expected behavior 71 5 17
Effect of changes in other future expected assumptions 106 128 (139)
Effect of changes in the instrument-specific credit risk on market risk benefits 79 83 (517)
Ending balance (919) 335 1,103
Reconciliation of the gross balances in an asset or liability position:      
Asset position 2,182 1,427 1,015
Liability position (1,263) (1,762) (2,118)
Net asset (liability) position $ 919 $ (335) $ (1,103)
Weighted average attained age of contractholders 69 years 69 years 68 years
Changes in unrealized (gains) losses in net income relating to liabilities held at end of period $ (2,111) $ (1,551) $ (2,044)
Changes in unrealized (gains) losses in other comprehensive income relating to liabilities held at end of period 85 84 (505)
Death benefits      
Reconciliation of the gross balances in an asset or liability position:      
Guaranteed benefit amount in excess of current account balances (net amount at risk) 462 913 2,781
Living benefits      
Reconciliation of the gross balances in an asset or liability position:      
Guaranteed benefit amount in excess of current account balances (net amount at risk) 2,429 2,513 3,364
Composite (greater of)      
Reconciliation of the gross balances in an asset or liability position:      
Guaranteed benefit amount in excess of current account balances (net amount at risk) $ 2,829 $ 3,308 $ 5,830