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Investments (Details) - Equity Securities - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Investment disclosure details    
Equity securities, cost $ 747 $ 749
Gross gains 92 148
Gross losses 32 4
Equity securities, at fair value 807 893
Net recognized gains (losses) on equity securities still held (61) 78
Common stock [Member]    
Investment disclosure details    
Equity securities, cost 706 694
Gross gains 89 137
Gross losses 32 4
Equity securities, at fair value 763 827
Non-redeemable preferred stock [Member]    
Investment disclosure details    
Equity securities, cost 41 55
Gross gains 3 11
Gross losses 0 0
Equity securities, at fair value $ 44 $ 66