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Loans - Credit Card Portfolio - Impaired Loans (Details) - Credit card - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]      
Impaired credit card loans with an allowance $ 1,365   $ 1,319
Allowance for loan losses related to impaired credit card loans 461   $ 440
Average impaired credit card loans 1,340 $ 1,224  
Interest income on impaired credit card loans $ 17 $ 15