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Liability for Future Policy Benefits (Additional Insurance Reserves) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Additional Liability, Long-Duration Insurance [Line Items]        
Balance, including amounts in AOCI, BOP, post-flooring $ 12,822 $ 11,934    
Balance, including amounts in AOCI, EOP, post-flooring 14,439 12,822 $ 11,934  
Individual Life | Gross Basis        
Additional Liability, Long-Duration Insurance [Line Items]        
Interest accrual 488 435 347  
Gross assessments $ 2,947 $ 2,678 $ 3,018  
Weighted-average duration of the liability in years (at original discount rate) 22 years 23 years 19 years  
Weighted-average interest rate (at original discount rate) 3.40% 3.38% 3.38%  
Total | Individual Life        
Additional Liability, Long-Duration Insurance [Line Items]        
Balance, including amounts in AOCI, BOP, post-flooring $ 12,684 $ 11,708 $ 10,929  
Flooring impact and amounts in AOCI 1,285 (909) (1,186)  
Balance, excluding amounts in AOCI, BOP, pre-flooring 13,969 10,799 9,743  
Effect of assumption update   23 2,200 $ (1)
Effect of actual variances from expected experience and other activity   32 (221) 55
Adjusted balance, BOP   14,024 12,778 $ 9,797
Assessment collected 938 973 858  
Interest accrual 488 435 347  
Benefits paid (301) (217) (203)  
Other adjustments 2 0 0  
Balance, excluding amounts in AOCI, EOP, pre-flooring 15,151 13,969 10,799  
Flooring impact and amounts in AOCI (843) (1,285) 909  
Balance, including amounts in AOCI, EOP, post-flooring 14,308 12,684 11,708  
Less: Reinsurance recoverable 5,852 5,075 4,623  
Total balance after reinsurance recoverable 8,456 7,609 7,085  
Other businesses        
Additional Liability, Long-Duration Insurance [Line Items]        
Total balance after reinsurance recoverable 131 138 226  
Total balance        
Additional Liability, Long-Duration Insurance [Line Items]        
Total balance after reinsurance recoverable $ 8,587 $ 7,747 $ 7,311