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Non-Interest Revenue and Expense Detail (Details 2) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Details Of Certain Statements Of Income Lines Details [Abstract]        
Professional services $ 568 $ 429 $ 1,527 $ 1,332
Occupancy and equipment 501 630 1,534 1,862
Gain on sale of held for sale (HFS) portfolio 0 0 0 (1,218)
Other 429 439 1,220 1,412
Total other, net $ 1,498 $ 1,498 $ 4,281 $ 3,388