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Investments (Details) - Investment Information, Equity Securities - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Investment disclosure details      
Equity securities, cost $ 755   $ 749
Gross gains 74   148
Gross losses 29   4
Equity securities, at fair value 800   893
Net recognized gains (losses) on equity securities still held (85) $ 51  
Common stock [Member]      
Investment disclosure details      
Equity securities, cost 706   694
Gross gains 66   137
Gross losses 27   4
Equity securities, at fair value 745   827
Non-redeemable preferred stock [Member]      
Investment disclosure details      
Equity securities, cost 49   55
Gross gains 8   11
Gross losses 2   0
Equity securities, at fair value $ 55   $ 66