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Investments in Securities Trading 2 (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]      
Net trading gains (losses) $ 126,000,000 $ 190,000,000 $ 28,000,000
Net trading gains (losses) recognized in the period related to securities still held at period end $ 55,000,000 $ 161,000,000 $ (19,000,000)