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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 ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivative [Line Items]      
Net unrealized loss on available-for-sale securities designated in fair value hedges, net of related taxes $ 23,000,000 $ 12,000,000 $ (24,000,000)
Derivatives designated as hedging instruments | Fair Value Hedges      
Derivative [Line Items]      
Amount of gain (loss) on derivative recognized in income 160,000,000 (265,000,000) 14,000,000
Gain (loss) on fair value hedges recognized in earnings (155,000,000) 271,000,000 (7,000,000)
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 (6,000,000) (101,000,000) (92,000,000)
Gain (loss) on fair value hedges recognized in earnings 6,000,000 101,000,000 92,000,000
Derivatives designated as hedging instruments | Fair Value Hedges | Investment securities available for sale | Interest-rate contracts | Processing fees and other revenue      
Derivative [Line Items]      
Amount of gain (loss) on derivative recognized in income 43,000,000 16,000,000 (44,000,000)
Gain (loss) on fair value hedges recognized in earnings (40,000,000) (17,000,000) 39,000,000
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 221,000,000 (241,000,000) 0
Gain (loss) on fair value hedges recognized in earnings (221,000,000) 241,000,000 0
Derivatives designated as hedging instruments | Fair Value Hedges | Long-term debt | Interest-rate contracts | Processing fees and other revenue      
Derivative [Line Items]      
Amount of gain (loss) on derivative recognized in income (98,000,000) 61,000,000 150,000,000
Gain (loss) on fair value hedges recognized in earnings 100,000,000 (54,000,000) (138,000,000)
Derivatives designated as hedging instruments | Cash Flow Hedges      
Derivative [Line Items]      
Amount of gain (loss) on derivative recognized in income 24,000,000 10,000,000 9,000,000
Gain (loss) on derivative recognized in OCI (39,000,000) 55,000,000 124,000,000
Gain (loss) on hedges reclassified to income 0 (4,000,000) (4,000,000)
Derivatives designated as hedging instruments | Cash Flow Hedges | Foreign exchange contracts      
Derivative [Line Items]      
Gain (loss) on derivative recognized in OCI (39,000,000) 55,000,000 126,000,000
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 24,000,000 10,000,000 6,000,000
Gain (loss) on hedges reclassified to income 0 0 0
Derivatives designated as hedging instruments | Cash Flow Hedges | Interest-rate contracts      
Derivative [Line Items]      
Gain (loss) on derivative recognized in OCI 0 0 (2,000,000)
Derivatives designated as hedging instruments | Cash Flow Hedges | Interest-rate contracts | Net interest revenue      
Derivative [Line Items]      
Amount of gain (loss) on derivative recognized in income 0 0 3,000,000
Gain (loss) on hedges reclassified to income 0 (4,000,000) (4,000,000)
Derivatives designated as hedging instruments | Investment Hedges      
Derivative [Line Items]      
Amount of gain (loss) on derivative recognized in income 0 0 0
Gain (loss) on derivative recognized in OCI 109,000,000 0 0
Gain (loss) on hedges reclassified to income 0 0 0
Derivatives designated as hedging instruments | Investment Hedges | Foreign exchange contracts      
Derivative [Line Items]      
Gain (loss) on derivative recognized in OCI 109,000,000 0 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 0
Gain (loss) on hedges reclassified to income $ 0 $ 0 $ 0