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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, 2018
Mar. 31, 2017
Derivative [Line Items]    
Net unrealized gains (losses) on available-for-sale securities designated in fair value hedges, net of related taxes $ (4) $ (6)
Derivatives designated as hedging instruments | Fair Value Hedges    
Derivative [Line Items]    
Amount of gain (loss) on derivative recognized in income 89 969
Gain (loss) on fair value hedges recognized in earnings (100) (970)
Derivatives designated as hedging instruments | Fair Value Hedges | Investment securities available-for-sale | Interest-rate contracts(6) | Processing fees and other revenue    
Derivative [Line Items]    
Amount of gain (loss) on derivative recognized in income 0 12
Gain (loss) on fair value hedges recognized in earnings 0 (11)
Derivatives designated as hedging instruments | Fair Value Hedges | Investment securities available-for-sale | Interest-rate contracts(6) | Net interest revenue    
Derivative [Line Items]    
Amount of gain (loss) on derivative recognized in income 21 0
Gain (loss) on fair value hedges recognized in earnings (21) 0
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 (13) (2)
Gain (loss) on fair value hedges recognized in earnings 13 2
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 248 979
Gain (loss) on fair value hedges recognized in earnings (248) (980)
Derivatives designated as hedging instruments | Fair Value Hedges | Long-term debt | Interest-rate contracts(6) | Processing fees and other revenue    
Derivative [Line Items]    
Amount of gain (loss) on derivative recognized in income 0 (20)
Gain (loss) on fair value hedges recognized in earnings 0 19
Derivatives designated as hedging instruments | Fair Value Hedges | Long-term debt | Interest-rate contracts(6) | Net interest revenue    
Derivative [Line Items]    
Amount of gain (loss) on derivative recognized in income (167) 0
Gain (loss) on fair value hedges recognized in earnings 156 0
Derivatives designated as hedging instruments | Cash Flow Hedges | Interest-rate contracts(6)    
Derivative [Line Items]    
Gain (loss) on derivative recognized in OCI (21) 0
Derivatives designated as hedging instruments | Cash Flow Hedges | Interest-rate contracts(6) | Net interest revenue    
Derivative [Line Items]    
Amount of gain (loss) on derivative recognized in income 1 0
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 (95) (106)
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 7 6
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 8 6
Gain (loss) on derivative recognized in OCI (152) (120)
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 (36) (14)
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