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Non-Interest Revenue and Expense Detail (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Details Of Certain Statements Of Income Lines Details [Abstract]      
Foreign currency conversion fee revenue $ 852 $ 877 $ 877
Delinquency fees 788 722 667
Loyalty Partner-related fees 379 383 310
Service fees 361 366 375
Other 137 160 185
Total Other commissions and fees $ 2,517 $ 2,508 $ 2,414