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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 ($)
3 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative [Line Items]          
Net unrealized gains (losses) on available-for-sale securities designated in fair value hedges, net of related taxes $ (4,000,000) $ (13,000,000) $ (22,000,000) $ (23,000,000) $ (12,000,000)
Derivatives designated as hedging instruments | Fair Value Hedges | Processing fees and other revenue          
Derivative [Line Items]          
Amount of gain (loss) on derivative recognized in income     645,000,000 160,000,000 (265,000,000)
Gain (loss) on fair value hedges recognized in earnings     (642,000,000) (155,000,000) 271,000,000
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     39,000,000 43,000,000 16,000,000
Gain (loss) on fair value hedges recognized in earnings     (37,000,000) (40,000,000) (17,000,000)
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     18,000,000 (6,000,000) (101,000,000)
Gain (loss) on fair value hedges recognized in earnings     (18,000,000) 6,000,000 101,000,000
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     626,000,000 221,000,000 (241,000,000)
Gain (loss) on fair value hedges recognized in earnings     (626,000,000) (221,000,000) 241,000,000
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     (38,000,000) (98,000,000) 61,000,000
Gain (loss) on fair value hedges recognized in earnings     39,000,000 100,000,000 (54,000,000)
Derivatives designated as hedging instruments | Cash Flow Hedges          
Derivative [Line Items]          
Amount of gain (loss) on derivative recognized in income     26,000,000 24,000,000 10,000,000
Gain (loss) on derivative recognized in OCI     (118,000,000) (39,000,000) 55,000,000
Gain (loss) on hedges reclassified to income     0 0 (4,000,000)
Derivatives designated as hedging instruments | Cash Flow Hedges | Interest-rate contracts(6)          
Derivative [Line Items]          
Gain (loss) on derivative recognized in OCI     (14,000,000) 0 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     2,000,000 0 0
Gain (loss) on hedges reclassified to income     0 0 (4,000,000)
Derivatives designated as hedging instruments | Cash Flow Hedges | Foreign exchange contracts          
Derivative [Line Items]          
Gain (loss) on derivative recognized in OCI     (104,000,000) (39,000,000) 55,000,000
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 24,000,000 10,000,000
Gain (loss) on hedges reclassified to income     0 0 0
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     (160,000,000) 109,000,000 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     (160,000,000) 109,000,000 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