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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]      
Interest expense — Long-term debt $ (454) $ (420) $ (319)
Interest income — Loans 4,267 4,023 3,677
Investment banking and debt placement fees 630 650 603
Deposits (853) (517) (278)
Other income [1] 68 176 153
Interest Expense, Long-Term Debt [Member] | Fair Value Hedging [Member]      
Gain (Loss) on Fair Value Hedges Recognized in Earnings [Abstract]      
Net income (expense) recognized on fair value hedges   (17)  
Interest Expense, Long-Term Debt [Member] | Cash Flow Hedging [Member]      
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract]      
Net income (expense) recognized on cash flow hedges (1)   (4)
Interest Income [Member] | Fair Value Hedging [Member]      
Gain (Loss) on Fair Value Hedges Recognized in Earnings [Abstract]      
Net income (expense) recognized on fair value hedges   0  
Interest Income [Member] | Cash Flow Hedging [Member]      
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract]      
Net income (expense) recognized on cash flow hedges 15   19
Investment Banking And Debt Placement [Member] | Fair Value Hedging [Member]      
Gain (Loss) on Fair Value Hedges Recognized in Earnings [Abstract]      
Net income (expense) recognized on fair value hedges   0  
Investment Banking And Debt Placement [Member] | Cash Flow Hedging [Member]      
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract]      
Net income (expense) recognized on cash flow hedges 0   0
Interest Expense, Deposits [Member] | Fair Value Hedging [Member]      
Gain (Loss) on Fair Value Hedges Recognized in Earnings [Abstract]      
Net income (expense) recognized on fair value hedges   1  
Interest Expense, Deposits [Member] | Cash Flow Hedging [Member]      
Cash Flow Hedges Derivative Instruments at Fair Value, Net [Abstract]      
Net income (expense) recognized on cash flow hedges 0   0
Other Income [Member] | Fair Value Hedging [Member]      
Gain (Loss) on Fair Value Hedges Recognized in Earnings [Abstract]      
Net income (expense) recognized on fair value hedges   0  
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
Net income (expense) recognized on cash flow hedges 32   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 (247) (5) 0
Recognized on derivatives designated as hedging instruments 231 (12) 49
Net income (expense) recognized on fair value hedges (16)   49
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 (1) (2) (4)
Gains (losses) (before tax) recognized in income for hedge ineffectiveness     0
Net income (expense) recognized on cash flow hedges   (2)  
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
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 15 (68) 19
Gains (losses) (before tax) recognized in income for hedge ineffectiveness     0
Net income (expense) recognized on cash flow hedges   (68)  
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
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 0 2 0
Gains (losses) (before tax) recognized in income for hedge ineffectiveness     0
Net income (expense) recognized on cash flow hedges   2  
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) 1 0
Recognized on derivatives designated as hedging instruments 0 0 0
Net income (expense) recognized on fair value hedges (1)   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
Net income (expense) recognized on cash flow hedges   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 0 107
Recognized on derivatives designated as hedging instruments 0 0 (103)
Net income (expense) recognized on fair value hedges 0   4
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 0 31 $ 0
Net income (expense) recognized on cash flow hedges   $ 31  
Foreign Exchange Contract [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 0    
Foreign Exchange Contract [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 0    
Foreign Exchange Contract [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 0    
Foreign Exchange Contract [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    
Foreign Exchange Contract [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 $ 32    
[1]
Net securities gains (losses) totaled $20 million for the year ended December 31, 2019, less than $1 million for the year ended December 31, 2018, and $1 million for the year ended December 31, 2017. For 2019, 2018, and 2017, we did not have any impairment losses related to securities.