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Market Risk Benefits - Balances of and Changes in Market Risk Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Market Risk Benefit [Roll Forward]      
Beginning balance $ (919) $ 335 $ 335
Issuances 5 5 24
Interest accrual and time decay (18) (10) (66)
Reserve increase from attributed fees collected 181 184 790
Reserve release for benefit payments and derecognition (2) (4) (11)
Effect of changes in interest rates and bond markets 269 (527) (1,078)
Effect of changes in equity markets and subaccount performance 322 (730) (1,228)
Effect of changes in equity index volatility 25 39 59
Actual policyholder behavior different from expected behavior 25 31 71
Effect of changes in other future expected assumptions (1) 0 106
Effect of changes in the instrument-specific credit risk on market risk benefits (1) 48 79
Ending balance (114) (629) (919)
Reconciliation of the gross balances in an asset or liability position:      
Asset position 1,742 1,964 2,182
Liability position (1,628) (1,335) (1,263)
Net asset (liability) position $ 114 $ 629 $ 919
Weighted average attained age of contractholders 69 years 69 years 69 years
Changes in unrealized (gains) losses in net income relating to liabilities held at end of period $ 603 $ (1,202) $ (2,111)
Changes in unrealized (gains) losses in other comprehensive income (loss) relating to liabilities held at end of period 0 48 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) 626 578 462
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) 2,761 2,233 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) $ 3,318 $ 2,735 $ 2,829