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Derivatives and Hedging Activities - Effect of Fair Value and Cash Flow Hedges on Income (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]      
Interest expense — Long-term debt $ (420) $ (319) $ (218)
Interest income — Loans 4,023 3,677 2,773
Investment banking and debt placement fees 650 603 482
Deposits (517) (278) (171)
Other income [1] 176 153 114
Other Income [Member] | Cash Flow Hedging [Member]      
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract]      
Gains (losses) (before tax) recognized in income for hedge ineffectiveness   0 0
Interest Rate [Member] | Interest Expense, Long-Term Debt [Member] | Fair Value Hedging [Member]      
Gain (Loss) on Fair Value Hedges Recognized in Earnings [Abstract]      
Recognized on hedged items (5) 0 0
Recognized on derivatives designated as hedging instruments (12) 49 96
Net income (expense) recognized on fair value hedges (17) 49 96
Interest Rate [Member] | Interest Expense, Long-Term Debt [Member] | Cash Flow Hedging [Member]      
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract]      
Realized gains (losses) (pre-tax) reclassified from AOCI into net income (2) (4) (4)
Gains (losses) (before tax) recognized in income for hedge ineffectiveness   0 0
Net income (expense) recognized on cash flow hedges (2) (4) (4)
Interest Rate [Member] | Interest Income [Member] | Fair Value Hedging [Member]      
Gain (Loss) on Fair Value Hedges Recognized in Earnings [Abstract]      
Recognized on hedged items 0 0 0
Recognized on derivatives designated as hedging instruments 0 0 0
Net income (expense) recognized on fair value hedges 0 0 0
Interest Rate [Member] | Interest Income [Member] | Cash Flow Hedging [Member]      
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract]      
Realized gains (losses) (pre-tax) reclassified from AOCI into net income (68) 19 85
Gains (losses) (before tax) recognized in income for hedge ineffectiveness   0 0
Net income (expense) recognized on cash flow hedges (68) 19 85
Interest Rate [Member] | Investment Banking And Debt Placement [Member] | Fair Value Hedging [Member]      
Gain (Loss) on Fair Value Hedges Recognized in Earnings [Abstract]      
Recognized on hedged items 0 0 0
Recognized on derivatives designated as hedging instruments 0 0 0
Net income (expense) recognized on fair value hedges 0 0 0
Interest Rate [Member] | Investment Banking And Debt Placement [Member] | Cash Flow Hedging [Member]      
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract]      
Realized gains (losses) (pre-tax) reclassified from AOCI into net income 2 0 0
Gains (losses) (before tax) recognized in income for hedge ineffectiveness   0 0
Net income (expense) recognized on cash flow hedges 2 0 0
Interest Rate [Member] | Interest Expense, Deposits [Member] | Fair Value Hedging [Member]      
Gain (Loss) on Fair Value Hedges Recognized in Earnings [Abstract]      
Recognized on hedged items 1 0 0
Recognized on derivatives designated as hedging instruments 0 0 0
Net income (expense) recognized on fair value hedges 1 0 0
Interest Rate [Member] | Interest Expense, Deposits [Member] | Cash Flow Hedging [Member]      
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract]      
Realized gains (losses) (pre-tax) reclassified from AOCI into net income 0 0 0
Gains (losses) (before tax) recognized in income for hedge ineffectiveness   0 0
Net income (expense) recognized on cash flow hedges 0 0 0
Interest Rate [Member] | Other Income [Member] | Fair Value Hedging [Member]      
Gain (Loss) on Fair Value Hedges Recognized in Earnings [Abstract]      
Recognized on hedged items 0 107 97
Recognized on derivatives designated as hedging instruments 0 (103) (95)
Net income (expense) recognized on fair value hedges 0 4 2
Interest Rate [Member] | Other Income [Member] | Cash Flow Hedging [Member]      
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract]      
Realized gains (losses) (pre-tax) reclassified from AOCI into net income 31 0 0
Net income (expense) recognized on cash flow hedges $ 31 $ 0 $ 0
[1] Net securities gains (losses) totaled less than $1 million for each of the years ended December 31, 2018, 2017, and 2016. For 2018, 2017, and 2016, we did not have any impairment losses related to securities.