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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Investment Securities - AFS          
Investment Securities—AFS          
Carrying amount of currently or previously hedged asset $ 532   $ 532   $ 201
Basis adjustments included in carrying amount 23   23   4
Borrowings          
Borrowings          
Carrying amount of currently or previously hedged liability 104,752   104,752   102,899
Basis adjustments included in carrying amount 2,428   2,428   $ (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 (14) $ 0 (19) $ 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 14 0 19 0  
Fair Value Hedges | Interest expense | Interest rate          
Gain (Loss) on Fair Value Hedges Recognized in Interest Expense          
Gains (losses) recognized in Interest Expense 2,470 (619) 4,047 (2,460)  
Fair Value Hedges | Interest expense | Borrowings          
Gain (Loss) on Fair Value Hedges Recognized in Interest Expense          
Gains (losses) recognized in Interest Expense (2,494) 587 (4,115) 2,439  
Net Investment Hedges | Foreign exchange          
Net Investment Hedges          
Gains (losses) recognized in OCI, net of tax (114) 395 (50) 247  
Forward points excluded from hedge effectiveness testing - Recognized in Interest income   $ 24   $ 31  
Forward points excluded from hedge effectiveness testing—Recognized in Interest income $ 42   $ 77