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Market Risk Benefits - Balances of and Changes in Market Risk Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Market Risk Benefit [Roll Forward]          
Beginning balance $ (769) $ (830) $ (919) $ 335 $ 335
Issuances 6 6 17 18 24
Interest accrual and time decay (25) (10) (74) (35) (66)
Reserve increase from attributed fees collected 194 206 561 585 790
Reserve release for benefit payments and derecognition (2) (2) (7) (9) (11)
Effect of changes in interest rates and bond markets 9 616 149 (156) (1,078)
Effect of changes in equity markets and subaccount performance (543) (400) (932) (1,282) (1,228)
Effect of changes in equity index volatility 20 8 60 62 59
Actual policyholder behavior different from expected behavior 7 7 45 48 71
Effect of changes in other future expected assumptions 94 106 93 106 106
Effect of changes in the instrument-specific credit risk on market risk benefits 13 63 11 98 79
Ending balance (996) (230) (996) (230) (919)
Reconciliation of the gross balances in an asset or liability position:          
Asset position 2,225 1,809 2,225 1,809 2,182
Liability position (1,229) (1,579) (1,229) (1,579) (1,263)
Net asset (liability) position $ 996 $ 230 $ 996 $ 230 $ 919
Weighted average attained age of contractholders 70 years 69 years 70 years 69 years 69 years
Changes in unrealized (gains) losses in net income relating to liabilities held at end of period $ (461) $ 312 $ (701) $ (1,250) $ (2,111)
Changes in unrealized (gains) losses in other comprehensive income (loss) relating to liabilities held at end of period 14 62 15 102 85
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) 288 343 288 343 462
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) 1,817 1,867 1,817 1,867 2,429
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) $ 2,086 $ 2,177 $ 2,086 $ 2,177 $ 2,829