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Investments (Details) - Investment Information, Equity Securities - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Investment disclosure details      
Equity securities, cost $ 757   $ 749
Gross gains 61   148
Gross losses 44   4
Equity securities, at fair value 774   893
Net recognized gains (losses) on equity securities still held (110) $ 45  
Common stock [Member]      
Investment disclosure details      
Equity securities, cost 704   694
Gross gains 55   137
Gross losses 43   4
Equity securities, at fair value 716   827
Non-redeemable preferred stock [Member]      
Investment disclosure details      
Equity securities, cost 53   55
Gross gains 6   11
Gross losses 1   0
Equity securities, at fair value $ 58   $ 66