XML 129 R114.htm IDEA: XBRL DOCUMENT v3.19.2
Loans - Credit Card Portfolio - Impaired Loans (Details) - Credit card - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]          
Impaired credit card loans with an allowance $ 1,388   $ 1,388   $ 1,319
Allowance for loan losses related to impaired credit card loans 472   472   $ 440
Average impaired credit card loans 1,367 $ 1,244 1,353 $ 1,234  
Interest income on impaired credit card loans $ 18 $ 16 $ 35 $ 31