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Investments (Details) - Investment Information, Equity Securities - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Investment disclosure details      
Equity securities, cost $ 394   $ 387
Gross gains 122   78
Gross losses 3   12
Equity securities, at fair value 513   453
Net recognized gains (losses) on equity securities still held 51 $ (33)  
Public common stock [Member]      
Investment disclosure details      
Equity securities, cost 359   352
Gross gains 111   70
Gross losses 3   12
Equity securities, at fair value 467   410
Non-redeemable preferred stock [Member]      
Investment disclosure details      
Equity securities, cost 35   35
Gross gains 11   8
Gross losses 0   0
Equity securities, at fair value $ 46   $ 43