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Non-Interest Revenue and Expense Detail (Details 2) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Details Of Certain Statements Of Income Lines Details [Abstract]        
Professional services $ 655 $ 817 $ 1,279 $ 1,509
Occupancy and equipment 415 467 849 929
Card and merchant-related fraud Losses 83 102 183 186
Communications 85 101 173 194
Gain on business travel joint venture 0 (626) 0 (626)
Other 297 387 450 605
Total other, net $ 1,535 $ 1,248 $ 2,934 $ 2,797