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Investments (Details) - Equity Securities - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Investment disclosure details    
Equity securities, cost $ 749 $ 415
Gross gains 148 81
Gross losses 4 12
Equity securities, at fair value 893 484
Net recognized gains on equity securities still held 78 27
Common stock [Member]    
Investment disclosure details    
Equity securities, cost 694 356
Gross gains 137 72
Gross losses 4 12
Equity securities, at fair value 827 416
Non-redeemable preferred stock [Member]    
Investment disclosure details    
Equity securities, cost 55 59
Gross gains 11 9
Gross losses 0 0
Equity securities, at fair value $ 66 $ 68