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Loans - Credit Card Portfolio - Impaired Loans (Details) - Credit card - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]          
Impaired credit card loans with an allowance $ 1,423   $ 1,423   $ 1,319
Allowance for loan losses related to impaired credit card loans 488   488   $ 440
Average impaired credit card loans 1,406 $ 1,267 1,371 $ 1,245  
Interest income on impaired credit card loans $ 18 $ 17 $ 53 $ 48