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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Market Risk Benefit [Roll Forward]          
Beginning balance $ (830) $ 360 $ 335 $ 1,103 $ 1,103
Issuances 6 5 18 13 17
Interest accrual and time decay (10) (15) (35) (36) (53)
Reserve increase from attributed fees collected 206 202 585 585 788
Reserve release for benefit payments and derecognition (2) (6) (9) (24) (35)
Effect of changes in interest rates and bond markets 616 (1,241) (156) (1,325) (367)
Effect of changes in equity markets and subaccount performance (400) 500 (1,282) (402) (1,267)
Effect of changes in equity index volatility 8 (13) 62 (83) (67)
Actual policyholder behavior different from expected behavior 7 (16) 48 (10) 5
Effect of changes in other future expected assumptions 106 128 106 128 128
Effect of changes in the instrument-specific credit risk on market risk benefits 63 (23) 98 (68) 83
Ending balance (230) (119) (230) (119) 335
Reconciliation of the gross balances in an asset or liability position:          
Asset position 1,809 1,644 1,809 1,644 1,427
Liability position (1,579) (1,525) (1,579) (1,525) (1,762)
Net asset (liability) position $ 230 $ 119 $ 230 $ 119 $ (335)
Weighted average attained age of contractholders 69 years 69 years 69 years 69 years 69 years
Changes in unrealized (gains) losses in net income relating to liabilities held at end of period $ 312 $ (650) $ (1,250) $ (1,681) $ (1,551)
Changes in unrealized (gains) losses in other comprehensive income relating to liabilities held at end of period 62 (23) 102 (67) 84
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) 343 2,091 343 2,091 913
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) 1,867 3,693 1,867 3,693 2,513
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) $ 2,177 $ 5,470 $ 2,177 $ 5,470 $ 3,308