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Investments in Securities Trading 2 (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Debt and Equity Securities, FV-NI [Line Items]        
Net trading gains $ 183 $ 21 $ 275 $ 119
Net trading gains recognized in the period related to securities still held at period end $ 147 $ 1 $ 227 $ 48