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Non-Interest Revenue and Expense Detail (Details 1) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Details Of Certain Statements Of Income Lines Details [Abstract]        
Global Network Services partner revenues $ 156 $ 173 $ 474 $ 513
Net realized gains on investment securities 1 20 1 100
Other 347 400 1,018 1,066
Total other revenues $ 504 $ 593 $ 1,493 $ 1,679