Intangible Assets, Amortization Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]
Six months ended June 30, 2015	$ 312	$ 349	$ 624	$ 690
Estimate for the remainder of 2015	749		749
Estimate for year ended December 31,
2016	1,351		1,351
2017	1,224		1,224
2018	1,102		1,102
2019	141		141
2020	123		123
Finite lived intangible assets [Member]
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]
Six months ended June 30, 2015			752
MSRs [Member]
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]
Six months ended June 30, 2015			127
Estimate for the remainder of 2015	127		127
Estimate for year ended December 31,
2016	221		221
2017	176		176
2018	145		145
2019	129		129
2020	115		115
Core deposit intangibles [Member]
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]
Six months ended June 30, 2015			511
Estimate for the remainder of 2015	511		511
Estimate for year ended December 31,
2016	919		919
2017	851		851
2018	$ 769		$ 769
2019
2020
Customer relationship and other intangibles [Member]
Finite-Lived Intangible Assets, Future Amortization Expense, Current and Five Succeeding Fiscal Years [Abstract]
Six months ended June 30, 2015			$ 114
Estimate for the remainder of 2015	$ 111		111
Estimate for year ended December 31,
2016	211		211
2017	197		197
2018	188		188
2019	12		12
2020	$ 8		$ 8