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Netting Arrangements Narratives (Details) - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Derivative [Line Items]    
Fair value of non-cash collateral we pledged $ 1,300,000,000 $ 1,300,000,000
Fair value of non-cash collateral received 55,400,000,000 51,200,000,000
Fair value of non-cash collateral received that can be resold or repledged 52,200,000,000 45,500,000,000
Fair value of securities received as collateral that have been resold or repledge 0 0
Derivative assets not subject to enforceable master netting arrangements 27,000,000 33,000,000
Derivative liabilities not subject to enforceable master netting arrangements 1,000,000 2,000,000
Cash and Cash Equivalents [Member]    
Derivative [Line Items]    
Securities purchased under agreements to resell $ 20,100,000,000 $ 20,700,000,000