Changes in Accumulated Other Comprehensive Income (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other non-interest revenue	$ 1,360	$ 1,457	$ 1,678
Other expense	(5,671)	(5,634)	$ (4,942)
Foreign Currency Translation Adjustments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other expense	1	(7)
Income tax benefit for other, net expense	(1)	14
Increase (decrease) due to amounts reclassified into earnings	$ 0	$ 7