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Investments (Details) - Investment Information, Equity Securities - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Investment disclosure details      
Equity securities, cost $ 761   $ 749
Gross gains 127   148
Gross losses 8   4
Equity securities, at fair value 880   893
Net recognized gains (losses) on equity securities still held (14) $ 23  
Common stock [Member]      
Investment disclosure details      
Equity securities, cost 705   694
Gross gains 118   137
Gross losses 7   4
Equity securities, at fair value 816   827
Non-redeemable preferred stock [Member]      
Investment disclosure details      
Equity securities, cost 56   55
Gross gains 9   11
Gross losses 1   0
Equity securities, at fair value $ 64   $ 66