Loans and Allowance for Credit Losses, Loans by Delinquency Status, Consumer (Details) - USD ($) $ in Millions	Jun. 30, 2015		Dec. 31, 2014	Dec. 31, 2008
By delinquency status:
Purchased Credit Impaired Loans	$ 21,555		$ 23,320
Loans	888,459	[1]	862,551
Total Consumer [Member]
By delinquency status:
Purchased Credit Impaired Loans	20,682		21,813	$ 40,100
Loans	450,437		447,725
Real estate 1-4 family first mortgage [Member]
By delinquency status:
Purchased Credit Impaired Loans	20,601		21,712
Loans	267,868		265,386
Real estate 1-4 family junior lien mortgage [Member]
By delinquency status:
Purchased Credit Impaired Loans	81		101
Loans	56,164		59,717
Credit Card [Member]
By delinquency status:
Purchased Credit Impaired Loans	0		0
Loans	31,135		31,119
Automobile [Member]
By delinquency status:
Purchased Credit Impaired Loans	0		0
Loans	57,801		55,740
Other revolving credit and installment [Member]
By delinquency status:
Purchased Credit Impaired Loans	0		0
Loans	37,469		35,763
Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Consumer [Member]
By delinquency status:
Current-29 DPD	394,839		386,901
30-59 DPD	3,666		4,288
60-89 DPD	1,448		1,719
90-119 DPD	754		942
120-179 DPD	811		1,057
180 or more DPD	4,348		4,737
Government insured/guaranteed loans	23,889		26,268
Loans, excluding Purchased Credit Impaired Loans	429,755		425,912
Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family first mortgage [Member]
By delinquency status:
Current-29 DPD	215,683		208,642
30-59 DPD	2,135		2,415
60-89 DPD	826		993
90-119 DPD	391		488
120-179 DPD	446		610
180 or more DPD	3,897		4,258
Government insured/guaranteed loans	23,889		26,268
Loans, excluding Purchased Credit Impaired Loans	247,267		243,674
Loans Excluding Purchased Credit-Impaired Loans [Member] | Real estate 1-4 family junior lien mortgage [Member]
By delinquency status:
Current-29 DPD	54,861		58,182
30-59 DPD	328		398
60-89 DPD	188		220
90-119 DPD	126		158
120-179 DPD	146		194
180 or more DPD	434		464
Government insured/guaranteed loans	0		0
Loans, excluding Purchased Credit Impaired Loans	56,083		59,616
Loans Excluding Purchased Credit-Impaired Loans [Member] | Credit Card [Member]
By delinquency status:
Current-29 DPD	30,473		30,356
30-59 DPD	213		239
60-89 DPD	145		160
90-119 DPD	107		136
120-179 DPD	196		227
180 or more DPD	1		1
Government insured/guaranteed loans	0		0
Loans, excluding Purchased Credit Impaired Loans	31,135		31,119
Loans Excluding Purchased Credit-Impaired Loans [Member] | Automobile [Member]
By delinquency status:
Current-29 DPD	56,715		54,365
30-59 DPD	833		1,056
60-89 DPD	193		235
90-119 DPD	55		78
120-179 DPD	4		5
180 or more DPD	1		1
Government insured/guaranteed loans	0		0
Loans, excluding Purchased Credit Impaired Loans	57,801		55,740
Loans Excluding Purchased Credit-Impaired Loans [Member] | Other revolving credit and installment [Member]
By delinquency status:
Current-29 DPD	37,107		35,356
30-59 DPD	157		180
60-89 DPD	96		111
90-119 DPD	75		82
120-179 DPD	19		21
180 or more DPD	15		13
Government insured/guaranteed loans	0		0
Loans, excluding Purchased Credit Impaired Loans	$ 37,469		$ 35,763

[1] Parenthetical amounts represent assets and liabilities for which we have elected the fair value option.