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Investments (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Investment [Line Items]      
Number of fixed maturity investments that did not produce income 8 2  
Securities on deposit under regulatory requirements $ 752 $ 632  
Accrued investment income 245 205  
Securities Loaned, Fair Value of Collateral $ 2,457 $ 2,155  
Securities lending transactions, ratio of fair value of collateral on hold to fair value of securities on loan 102.00% 102.00%  
Fixed Maturity Securities, Allowance for Credit Loss $ (9) $ (6)  
Fixed Maturity Securities [Member]      
Investment [Line Items]      
Proceeds 22,048 10,565 $ 11,122
Fixed Maturity Securities, Allowance for Credit Loss (9) (6)  
Third party investments      
Investment [Line Items]      
Future capital calls or investment obligations 1,504 1,558  
Rated notes      
Investment [Line Items]      
Future capital calls or investment obligations 185 329  
Maturity Overnight [Member] | Cash [Member]      
Investment [Line Items]      
Collateral received for securities loaned, at carrying value 2,221 1,874  
Maturity Overnight [Member] | United States Government Securities [Member]      
Investment [Line Items]      
Collateral received for securities loaned, at carrying value 224 281  
Maturity Overnight [Member] | Residential Mortgage-Backed Securities [Member]      
Investment [Line Items]      
Collateral received for securities loaned, at carrying value $ 12 $ 0