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Future Policy Benefits Reserves - Balances and Changes (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Present value of future net premiums            
Balance, January 1         $ 3,710 $ 3,993
Effect of changes in discount rate $ 147 $ (67) $ 147 $ (67) (125) (74)
Balance, January 1, at original locked in discount rate         3,585 3,919
Effect of changes in cash flow assumptions         111 28
Expect of actual variances from expected experience         (40) (112)
Adjusted balance, January 1 3,478 3,656 3,478 3,656 3,656 3,835
Interest accrual     139 153    
Net premiums: earned during period     (317) (332)    
Balance, end of period at original locked in discount rate 3,478 3,656 3,478 3,656    
Effect of changes in discount rate 147 (67) 147 (67) (125) (74)
Balance, September 30 3,625 3,589 3,625 3,589    
Present value of future benefits & expenses            
Balance, January 1         17,669 17,472
Effect of changes in discount rate 612 (873) 612 (873) (578) (125)
Balance, January 1, at original locked in discount rate     17,091 17,347    
Effect of changes in cash flow assumptions         126 36
Effect of actual variances from expected experience         33 (45)
Adjusted balance, January 1         17,250 17,338
Interest accrual     693 723    
Benefit & expense payments     (883) (945)    
Balance, end of period at original locked in discount rate 17,060 17,116 17,060 17,116    
Effect of changes in discount rate 612 (873) 612 (873) (578) $ (125)
Balance, September 30 17,672 16,243 17,672 16,243    
Net LFPB 14,047 12,654 14,047 12,654 $ 13,959  
Re-measurement gain (loss) of insurance claims and policyholders’ benefits $ (48) $ (41) $ (88) $ (75)