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Investments in Securities Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income [Line Items]        
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held $ 37 $ 635 $ 718 $ 1,100
Accumulated Other Comprehensive Income , Net of Tax, Available-for-sale Securities, Other-than-temporary Impairment not Recorded 191 52    
Accumulated Other Comprehensive Income , Net of Tax, Available-for-sale Gain, Other-than-temporary Impairment Recorded 0 224    
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax 39 46    
Accumulated other comprehensive income $ 230 $ 322