Changes in Accumulated Other Comprehensive Income (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other non-interest revenue	$ 2,029	$ 2,033	$ 2,989
Interest Expense, Long-term Debt	1,106	1,148	1,334
Other expense	(5,162)	(6,793)	$ (6,089)
Net Unrealized Investment Gains (Losses) on Investment Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other non-interest revenue	0	0
Income tax provision for other non-interest revenue	(3)	0
Increase (decrease) due to amounts reclassified into earnings	6	1
Foreign Currency Translation Adjustments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other expense	(4)	1
Income tax benefit for other, net expense	0	0
Increase (decrease) due to amounts reclassified into earnings	(4)	1
Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Increase (decrease) due to amounts reclassified into earnings	$ 2	$ 2