Intangible Assets, Amortization Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]
Nine months ended September 30, 2015	$ 311	$ 342	$ 935	$ 1,032
Estimate for the remainder of 2015	376		376
Estimate for year ended December 31,
2016	1,370		1,370
2017	1,239		1,239
2018	1,111		1,111
2019	146		146
2020	129		129
Finite lived intangible assets [Member]
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]
Nine months ended September 30, 2015			1,129
MSRs [Member]
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]
Nine months ended September 30, 2015			192
Estimate for the remainder of 2015	66		66
Estimate for year ended December 31,
2016	243		243
2017	194		194
2018	157		157
2019	136		136
2020	123		123
Core deposit intangibles [Member]
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]
Nine months ended September 30, 2015			767
Estimate for the remainder of 2015	255		255
Estimate for year ended December 31,
2016	919		919
2017	851		851
2018	769		769
2019	0		0
2020	0		0
Customer relationship and other intangibles [Member]
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]
Nine months ended September 30, 2015			170
Estimate for the remainder of 2015	55		55
Estimate for year ended December 31,
2016	208		208
2017	194		194
2018	185		185
2019	10		10
2020	$ 6		$ 6