Non-Interest Revenue and Expense Detail (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Details Of Certain Statements Of Income Lines Details [Abstract]
Global Network Services partner revenues	$ 615	$ 654	$ 640
Other	1,117	1,375	1,393
Total Other revenues	$ 1,732	$ 2,029	$ 2,033