Mortgage Banking Activities, Noninterest Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Servicing fees:
Contractually specified servicing fees	$ 1,008	$ 1,077	$ 2,028	$ 2,159
Late charges	46	48	99	104
Ancillary fees	81	87	152	167
Unreimbursed direct servicing costs	(109)	(84)	(243)	(232)
Net servicing fees	1,026	1,128	2,036	2,198
Changes in fair value of MSRs carried at fair value:
Net changes in valuation model inputs or assumptions	1,053	(835)	280	(1,276)
Other changes in fair value	(554)	(489)	(1,087)	(964)
Total changes in fair value	499	(1,324)	(807)	(2,240)
Amortization	(65)	(79)	(127)	(143)
Net Derivative Gains (Losses) From Economic Hedges Related To Mortgage Servicing Activities	(946)	1,310	(65)	2,158
Total servicing income, net	514	1,035	1,037	1,973
Net gains on mortgage loan origination/sales activities	1,191	688	2,215	1,260
Total mortgage banking noninterest income	1,705	1,723	3,252	3,233
Market-related valuation changes to MSRs, net of hedge results	$ 107	$ 475	$ 215	$ 882