Changes in Accumulated Other Comprehensive (Loss) Income (Details 1) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other non-interest revenue	$ 545	$ 521	$ 1,031	$ 989
Interest expense on long-term debt and other	286	305	561	612
Other expenses	470	1,535	1,890	2,934
(Decrease) increase due to amounts reclassified into earnings	0			1
Net Unrealized Gains (Losses) on Investment Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other non-interest revenue	0
Income tax provision for other non-interest revenue	0
(Decrease) increase due to amounts reclassified into earnings	0	0	(2)
Foreign Currency Translation Adjustments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
(Decrease) increase due to amounts reclassified into earnings		(1)	0	(1)
Accumulated Other Comprehensive Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
(Decrease) increase due to amounts reclassified into earnings	0	1	2	1
Reclassification out of accumulated other comprehensive income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
(Decrease) increase due to amounts reclassified into earnings		1	2
Reclassification out of accumulated other comprehensive income [Member] | Net Unrealized Gains (Losses) on Investment Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other non-interest revenue	0	0	4	0
Income tax provision for other non-interest revenue	0	0	(2)	0
(Decrease) increase due to amounts reclassified into earnings	0	0	2	0
Reclassification out of accumulated other comprehensive income [Member] | Foreign Currency Translation Adjustments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax benefit for other, net expense	0	0	0	0
Other, net expense, net of taxes	0	1	0	1
(Decrease) increase due to amounts reclassified into earnings	$ 0	$ 1	$ 0	$ 1