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Derivative Instruments and Hedging Activities - Gains (Losses) on Accounting Hedges and Fair Value Hedges (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Investment Securities - AFS          
Investment Securities—AFS          
Carrying amount of currently or previously hedged asset $ 689   $ 689   $ 201
Basis adjustments included in carrying amount 30   30   4
Borrowings          
Borrowings          
Carrying amount of currently or previously hedged liability 103,659   103,659   102,899
Basis adjustments included in carrying amount 4,393   4,393   $ (1,689)
Fair Value Hedges | Interest Income | Interest rate          
Gain (Loss) on Fair Value Hedges Recognized in Interest Expense          
Gains (losses) recognized in Interest Expense (7) $ 0 (26) $ 0  
Fair Value Hedges | Interest Income | Investment Securities - AFS          
Gain (Loss) on Fair Value Hedges Recognized in Interest Expense          
Gains (losses) recognized in Interest Expense 8 0 27 0  
Fair Value Hedges | Interest expense | Interest rate          
Gain (Loss) on Fair Value Hedges Recognized in Interest Expense          
Gains (losses) recognized in Interest Expense 1,999 (1,124) 6,046 (3,584)  
Fair Value Hedges | Interest expense | Borrowings          
Gain (Loss) on Fair Value Hedges Recognized in Interest Expense          
Gains (losses) recognized in Interest Expense (1,996) 1,124 (6,111) 3,563  
Net Investment Hedges | Foreign exchange          
Net Investment Hedges          
Gains (losses) recognized in OCI, net of tax 251 107 201 354  
Forward points excluded from hedge effectiveness testing - Recognized in Interest income   $ 13   $ 44  
Forward points excluded from hedge effectiveness testing—Recognized in Interest income $ 30   $ 107