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Derivative Financial Instruments - Schedule of Differences Between the Gains (Losses) on the Derivative and The Gains (Losses) on the Hedged Item (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Derivative [Line Items]    
Net unrealized loss on available-for-sale securities designated in fair value hedges, net of related taxes $ 6 $ (19)
Derivatives designated as hedging instruments | Fair Value Hedges    
Derivative [Line Items]    
Amount of gain (loss) on derivative recognized in income 969 510
Gain (loss) on fair value hedges recognized in earnings (970) (501)
Derivatives designated as hedging instruments | Fair Value Hedges | Investment securities available for sale | Foreign exchange contracts | Processing fees and other revenue    
Derivative [Line Items]    
Amount of gain (loss) on derivative recognized in income (2) 44
Gain (loss) on fair value hedges recognized in earnings 2 (44)
Derivatives designated as hedging instruments | Fair Value Hedges | Investment securities available for sale | Interest-rate contracts(7) | Processing fees and other revenue    
Derivative [Line Items]    
Amount of gain (loss) on derivative recognized in income 12 (30)
Gain (loss) on fair value hedges recognized in earnings (11) 31
Derivatives designated as hedging instruments | Fair Value Hedges | Deposits | Foreign exchange contracts | Processing fees and other revenue    
Derivative [Line Items]    
Amount of gain (loss) on derivative recognized in income 979 248
Gain (loss) on fair value hedges recognized in earnings (980) (248)
Derivatives designated as hedging instruments | Fair Value Hedges | Long-term debt | Interest-rate contracts(7) | Processing fees and other revenue    
Derivative [Line Items]    
Amount of gain (loss) on derivative recognized in income (20) 248
Gain (loss) on fair value hedges recognized in earnings 19 (240)
Derivatives designated as hedging instruments | Cash Flow Hedges    
Derivative [Line Items]    
Amount of gain (loss) on derivative recognized in income 6 5
Gain (loss) on derivative recognized in OCI (106) (113)
Gain (loss) on hedges reclassified to income 0 0
Derivatives designated as hedging instruments | Cash Flow Hedges | Foreign exchange contracts    
Derivative [Line Items]    
Gain (loss) on derivative recognized in OCI (106) (113)
Derivatives designated as hedging instruments | Cash Flow Hedges | Foreign exchange contracts | Net interest revenue    
Derivative [Line Items]    
Amount of gain (loss) on derivative recognized in income 6 5
Gain (loss) on hedges reclassified to income 0 0
Derivatives designated as hedging instruments | Investment Hedges    
Derivative [Line Items]    
Amount of gain (loss) on derivative recognized in income 0 0
Gain (loss) on derivative recognized in OCI (14) 0
Gain (loss) on hedges reclassified to income 0 0
Derivatives designated as hedging instruments | Investment Hedges | Foreign exchange contracts    
Derivative [Line Items]    
Gain (loss) on derivative recognized in OCI (14) 0
Derivatives designated as hedging instruments | Investment Hedges | Foreign exchange contracts | Gains (Losses) related to investment securities, net    
Derivative [Line Items]    
Amount of gain (loss) on derivative recognized in income 0 0
Gain (loss) on hedges reclassified to income $ 0 $ 0