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Fair Value of Financial Instruments - Carrying Amounts of Assets and Liabilities at Estimated Fair Value Measured on a Recurring Basis (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Assets      
Fixed maturity securities available for sale $ 36,110 $ 33,095  
Derivative asset 432 244  
Market risk benefits asset 106 117 $ 41
Total financial assets at fair value 8,229 8,286  
Derivatives:      
Market risk benefits liability 324 282 $ 469
Level 1      
Assets      
Cash and cash equivalents 2,821 2,286  
Short term investments 1,315 2,590  
Derivative asset 0 0  
Market risk benefits asset 0 0  
Total financial assets at fair value 5,542 6,210  
Derivatives:      
Market risk benefits liability 0 0  
Total financial liabilities at fair value 0 0  
Level 2      
Assets      
Cash and cash equivalents 0 0  
Short term investments 8 0  
Derivative asset 432 244  
Market risk benefits asset 0 0  
Total financial assets at fair value 29,002 25,720  
Derivatives:      
Market risk benefits liability 0 0  
Total financial liabilities at fair value 0 0  
Level 3      
Assets      
Cash and cash equivalents 0 0  
Short term investments 23 0  
Derivative asset 0 0  
Market risk benefits asset 106 117  
Total financial assets at fair value 8,229 8,286  
Derivatives:      
Market risk benefits liability 324 282  
Total financial liabilities at fair value 3,893 3,397  
NAV      
Assets      
Total financial assets at fair value 42 47  
Fair Value      
Assets      
Cash and cash equivalents 2,821 2,286  
Short term investments 1,346 2,590  
Derivative asset 432 244  
Market risk benefits asset 106 117  
Total financial assets at fair value 42,815 40,263  
Derivatives:      
Market risk benefits liability 324 282  
Total financial liabilities at fair value 3,893 3,397  
Reinsurance related embedded derivative, included in other assets | Level 1      
Assets      
Derivative asset 0 0  
Reinsurance related embedded derivative, included in other assets | Level 2      
Assets      
Derivative asset 260 279  
Reinsurance related embedded derivative, included in other assets | Level 3      
Assets      
Derivative asset 0 0  
Reinsurance related embedded derivative, included in other assets | Fair Value      
Assets      
Derivative asset 260 279  
FIA/ IUL embedded derivatives, included in contractholder funds | Level 1      
Derivatives:      
Derivative liability 0 0  
FIA/ IUL embedded derivatives, included in contractholder funds | Level 2      
Derivatives:      
Derivative liability 0 0  
FIA/ IUL embedded derivatives, included in contractholder funds | Level 3      
Derivatives:      
Derivative liability 3,569 3,115  
FIA/ IUL embedded derivatives, included in contractholder funds | Fair Value      
Derivatives:      
Derivative liability 3,569 3,115  
Asset-backed securities      
Assets      
Fixed maturity securities available for sale 11,892 11,467  
Asset-backed securities | Level 1      
Assets      
Fixed maturity securities available for sale 0 0  
Asset-backed securities | Level 2      
Assets      
Fixed maturity securities available for sale 5,592 5,204  
Asset-backed securities | Level 3      
Assets      
Fixed maturity securities available for sale 6,300 6,263  
Asset-backed securities | Fair Value      
Assets      
Fixed maturity securities available for sale 11,892 11,467  
Commercial mortgage-backed securities      
Assets      
Fixed maturity securities available for sale 3,715 3,063  
Commercial mortgage-backed securities | Level 1      
Assets      
Fixed maturity securities available for sale 0 0  
Commercial mortgage-backed securities | Level 2      
Assets      
Fixed maturity securities available for sale 3,686 3,026  
Commercial mortgage-backed securities | Level 3      
Assets      
Fixed maturity securities available for sale 29 37  
Commercial mortgage-backed securities | Fair Value      
Assets      
Fixed maturity securities available for sale 3,715 3,063  
Corporates      
Assets      
Fixed maturity securities available for sale 15,831 14,337  
Corporates | Level 1      
Assets      
Fixed maturity securities available for sale 25 40  
Corporates | Level 2      
Assets      
Fixed maturity securities available for sale 14,262 12,857  
Corporates | Level 3      
Assets      
Fixed maturity securities available for sale 1,544 1,440  
Corporates | Fair Value      
Assets      
Fixed maturity securities available for sale 15,831 14,337  
Hybrids      
Assets      
Fixed maturity securities available for sale 780 731  
Hybrids | Level 1      
Assets      
Fixed maturity securities available for sale 97 93  
Hybrids | Level 2      
Assets      
Fixed maturity securities available for sale 683 638  
Hybrids | Level 3      
Assets      
Fixed maturity securities available for sale 0 0  
Hybrids | Fair Value      
Assets      
Fixed maturity securities available for sale 780 731  
Municipals | Level 1      
Assets      
Fixed maturity securities available for sale 0 0  
Municipals | Level 2      
Assets      
Fixed maturity securities available for sale 1,597 1,431  
Municipals | Level 3      
Assets      
Fixed maturity securities available for sale 32 29  
Municipals | Fair Value      
Assets      
Fixed maturity securities available for sale 1,629 1,460  
Residential mortgage-backed securities      
Assets      
Fixed maturity securities available for sale 1,669 1,527  
Residential mortgage-backed securities | Level 1      
Assets      
Fixed maturity securities available for sale 0 0  
Residential mortgage-backed securities | Level 2      
Assets      
Fixed maturity securities available for sale 1,657 1,225  
Residential mortgage-backed securities | Level 3      
Assets      
Fixed maturity securities available for sale 12 302  
Residential mortgage-backed securities | Fair Value      
Assets      
Fixed maturity securities available for sale 1,669 1,527  
U.S. Government      
Assets      
Fixed maturity securities available for sale 329 271  
U.S. Government | Level 1      
Assets      
Fixed maturity securities available for sale 318 260  
U.S. Government | Level 2      
Assets      
Fixed maturity securities available for sale 11 11  
U.S. Government | Level 3      
Assets      
Fixed maturity securities available for sale 0 0  
U.S. Government | Fair Value      
Assets      
Fixed maturity securities available for sale 329 271  
Foreign Governments      
Assets      
Fixed maturity securities available for sale 265 239  
Foreign Governments | Level 1      
Assets      
Fixed maturity securities available for sale 0 0  
Foreign Governments | Level 2      
Assets      
Fixed maturity securities available for sale 249 223  
Foreign Governments | Level 3      
Assets      
Fixed maturity securities available for sale 16 16  
Foreign Governments | Fair Value      
Assets      
Fixed maturity securities available for sale 265 239  
Preferred securities      
Assets      
Equity and preferred securities 851 903  
Preferred securities | Level 1      
Assets      
Equity and preferred securities 285 320  
Preferred securities | Level 2      
Assets      
Equity and preferred securities 565 582  
Preferred securities | Level 3      
Assets      
Equity and preferred securities 1 1  
Preferred securities | Fair Value      
Assets      
Equity and preferred securities 851 903  
Equity securities | Level 1      
Assets      
Equity and preferred securities 681 621  
Equity securities | Level 2      
Assets      
Equity and preferred securities 0 0  
Equity securities | Level 3      
Assets      
Equity and preferred securities 11 10  
Equity securities | NAV      
Assets      
Equity and preferred securities 42 47  
Equity securities | Fair Value      
Assets      
Equity and preferred securities 734 678  
Investment in unconsolidated affiliates | Level 1      
Assets      
Investment in unconsolidated affiliates 0 0  
Investment in unconsolidated affiliates | Level 2      
Assets      
Investment in unconsolidated affiliates 0 0  
Investment in unconsolidated affiliates | Level 3      
Assets      
Investment in unconsolidated affiliates 107 23  
Investment in unconsolidated affiliates | Fair Value      
Assets      
Investment in unconsolidated affiliates 107 23  
Other long-term investments | Level 1      
Assets      
Other long-term investments 0 0  
Other long-term investments | Level 2      
Assets      
Other long-term investments 0 0  
Other long-term investments | Level 3      
Assets      
Other long-term investments 48 48  
Other long-term investments | Fair Value      
Assets      
Other long-term investments $ 48 $ 48