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Fair Value (Recurring Fair Value Measurements) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Jan. 01, 2021
Dec. 31, 2020
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS $ 281,412 $ 276,780    
Equity securities 757 1,684    
Unit-linked and FVO securities (1) 10,331 9,668    
Short-term investments (2) 6,045 4,935    
Derivative assets 8,737 11,411    
Market risk benefits, at estimated fair value 286 280    
Reinsured MRB assets     $ 51 $ 0
Separate account assets 144,634 146,038    
Liabilities [Abstract]        
Derivative liabilities 6,298 6,975    
Embedded derivatives within liability host contracts (7) 93 17    
Market risk benefits, at estimated fair value 3,179 3,763 $ 7,901  
Separate account liabilities 144,634 146,038    
Recurring        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 281,412 276,780    
Equity securities 757 1,684    
Unit-linked and FVO securities (1) 10,331 9,668    
Short-term investments (2) 5,797 4,573    
Other investments 1,386 1,132    
Derivative assets 8,737 11,411    
Market risk benefits, at estimated fair value 286 280    
Reinsured MRB assets 18 23    
Separate account assets 144,634 146,038    
Total assets (6) 453,358 451,589    
Liabilities [Abstract]        
Derivative liabilities 6,298 6,975    
Embedded derivatives within liability host contracts (7) 93 17    
Market risk benefits, at estimated fair value 3,179 3,763    
Total liabilities 9,578 10,796    
Recurring | Interest rate contracts        
Assets [Abstract]        
Derivative assets 3,675 4,572    
Liabilities [Abstract]        
Derivative liabilities 2,984 3,558    
Recurring | Foreign currency exchange rate contracts        
Assets [Abstract]        
Derivative assets 4,418 5,888    
Liabilities [Abstract]        
Derivative liabilities 2,744 2,870    
Recurring | Credit contracts        
Assets [Abstract]        
Derivative assets 236 151    
Liabilities [Abstract]        
Derivative liabilities 84 107    
Recurring | Equity market contracts        
Assets [Abstract]        
Derivative assets 408 800    
Liabilities [Abstract]        
Derivative liabilities 486 440    
Recurring | Derivative Liabilities Within Separate Accounts        
Liabilities [Abstract]        
Separate account liabilities 8 41    
Recurring | U.S. corporate        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 80,717 80,030    
Recurring | Foreign corporate        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 55,444 52,572    
Recurring | Foreign government        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 45,489 46,747    
Recurring | U.S. government and agency        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 32,252 32,229    
Recurring | RMBS        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 29,096 26,165    
Recurring | ABS & CLO        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 17,294 16,822    
Recurring | Municipals        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 11,171 12,152    
Recurring | CMBS        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 9,949 10,063    
Recurring | Level 1        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 15,330 15,959    
Equity securities 429 1,293    
Unit-linked and FVO securities (1) 7,520 7,101    
Short-term investments (2) 5,103 3,830    
Other investments 48 0    
Derivative assets 11 18    
Market risk benefits, at estimated fair value 0 0    
Reinsured MRB assets 0 0    
Separate account assets 66,229 65,107    
Total assets (6) 94,670 93,308    
Liabilities [Abstract]        
Derivative liabilities 16 5    
Embedded derivatives within liability host contracts (7) 0 0    
Market risk benefits, at estimated fair value 0 0    
Total liabilities 20 13    
Recurring | Level 1 | Interest rate contracts        
Assets [Abstract]        
Derivative assets 1 2    
Liabilities [Abstract]        
Derivative liabilities 5 1    
Recurring | Level 1 | Foreign currency exchange rate contracts        
Assets [Abstract]        
Derivative assets 2 8    
Liabilities [Abstract]        
Derivative liabilities 0 0    
Recurring | Level 1 | Credit contracts        
Assets [Abstract]        
Derivative assets 0 0    
Liabilities [Abstract]        
Derivative liabilities 0 0    
Recurring | Level 1 | Equity market contracts        
Assets [Abstract]        
Derivative assets 8 8    
Liabilities [Abstract]        
Derivative liabilities 11 4    
Recurring | Level 1 | Derivative Liabilities Within Separate Accounts        
Liabilities [Abstract]        
Separate account liabilities 4 8    
Recurring | Level 1 | U.S. corporate        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 0 0    
Recurring | Level 1 | Foreign corporate        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 0 0    
Recurring | Level 1 | Foreign government        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 0 0    
Recurring | Level 1 | U.S. government and agency        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 15,327 15,955    
Recurring | Level 1 | RMBS        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 3 4    
Recurring | Level 1 | ABS & CLO        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 0 0    
Recurring | Level 1 | Municipals        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 0 0    
Recurring | Level 1 | CMBS        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 0 0    
Recurring | Level 2        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 233,135 232,048    
Equity securities 79 132    
Unit-linked and FVO securities (1) 1,708 1,780    
Short-term investments (2) 667 686    
Other investments 363 206    
Derivative assets 8,688 11,094    
Market risk benefits, at estimated fair value 0 0    
Reinsured MRB assets 0 0    
Separate account assets 77,258 79,703    
Total assets (6) 321,898 325,649    
Liabilities [Abstract]        
Derivative liabilities 6,101 6,501    
Embedded derivatives within liability host contracts (7) 0 0    
Market risk benefits, at estimated fair value 0 0    
Total liabilities 6,105 6,516    
Recurring | Level 2 | Interest rate contracts        
Assets [Abstract]        
Derivative assets 3,674 4,570    
Liabilities [Abstract]        
Derivative liabilities 2,805 3,153    
Recurring | Level 2 | Foreign currency exchange rate contracts        
Assets [Abstract]        
Derivative assets 4,393 5,670    
Liabilities [Abstract]        
Derivative liabilities 2,737 2,820    
Recurring | Level 2 | Credit contracts        
Assets [Abstract]        
Derivative assets 228 69    
Liabilities [Abstract]        
Derivative liabilities 84 92    
Recurring | Level 2 | Equity market contracts        
Assets [Abstract]        
Derivative assets 393 785    
Liabilities [Abstract]        
Derivative liabilities 475 436    
Recurring | Level 2 | Derivative Liabilities Within Separate Accounts        
Liabilities [Abstract]        
Separate account liabilities 4 15    
Recurring | Level 2 | U.S. corporate        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 67,003 67,578    
Recurring | Level 2 | Foreign corporate        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 40,813 40,623    
Recurring | Level 2 | Foreign government        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 45,438 46,644    
Recurring | Level 2 | U.S. government and agency        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 16,925 16,274    
Recurring | Level 2 | RMBS        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 27,495 24,515    
Recurring | Level 2 | ABS & CLO        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 15,191 14,895    
Recurring | Level 2 | Municipals        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 11,171 12,152    
Recurring | Level 2 | CMBS        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 9,099 9,367    
Recurring | Level 3        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 32,947 28,773    
Equity securities 249 259    
Unit-linked and FVO securities (1) 1,103 787    
Short-term investments (2) 27 57    
Other investments 975 926    
Derivative assets 38 299    
Market risk benefits, at estimated fair value 286 280    
Reinsured MRB assets 18 23    
Separate account assets 1,147 1,228    
Total assets (6) 36,790 32,632    
Liabilities [Abstract]        
Derivative liabilities 181 469    
Embedded derivatives within liability host contracts (7) 93 17    
Market risk benefits, at estimated fair value 3,179 3,763    
Total liabilities 3,453 4,267    
Recurring | Level 3 | Interest rate contracts        
Assets [Abstract]        
Derivative assets 0 0    
Liabilities [Abstract]        
Derivative liabilities 174 404    
Recurring | Level 3 | Foreign currency exchange rate contracts        
Assets [Abstract]        
Derivative assets 23 210    
Liabilities [Abstract]        
Derivative liabilities 7 50    
Recurring | Level 3 | Credit contracts        
Assets [Abstract]        
Derivative assets 8 82    
Liabilities [Abstract]        
Derivative liabilities 0 15    
Recurring | Level 3 | Equity market contracts        
Assets [Abstract]        
Derivative assets 7 7    
Liabilities [Abstract]        
Derivative liabilities 0 0    
Recurring | Level 3 | Derivative Liabilities Within Separate Accounts        
Liabilities [Abstract]        
Separate account liabilities 0 18    
Recurring | Level 3 | U.S. corporate        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 13,714 12,452    
Recurring | Level 3 | Foreign corporate        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 14,631 11,949    
Recurring | Level 3 | Foreign government        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 51 103    
Recurring | Level 3 | U.S. government and agency        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 0 0    
Recurring | Level 3 | RMBS        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 1,598 1,646    
Recurring | Level 3 | ABS & CLO        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 2,103 1,927    
Recurring | Level 3 | Municipals        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 0 0    
Recurring | Level 3 | CMBS        
Assets [Abstract]        
Estimated Fair Value of Fixed Maturity Securities AFS 850 696    
Other limited partnership interests | Recurring        
Assets [Abstract]        
Investments, Fair Value Disclosure $ 52 $ 65