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Investments, Investment Income and Gains and Losses - Equity Securities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Investments [Abstract]    
Fair equity securities that have a readily determinable fair value   $ 415
Amortized cost of equity securities that have a readily determinable fair value   433
Carrying value of private equity securities that do not have a readily determinable fair value   $ 89
Impairment or value changes of equity securities without a readily determinable fair value  
Fair equity securities that have a readily determinable fair value, including disposal groups 64  
Amortized cost of equity securities that have a readily determinable fair value, including disposal groups 61  
Carrying value of private equity securities that do not have a readily determinable fair value, including disposal groups $ 192