Loans and Allowance for Credit Losses, Loans by Delinquency Status, Commercial (Details) - USD ($) $ in Millions	Jun. 30, 2015		Dec. 31, 2014	Dec. 31, 2008
By delinquency status:
90+ DPD and still accruing	$ 15,161		$ 17,810
Nonaccrual loans	12,443		12,848
Purchased Credit Impaired Loans	21,555		23,320
Loans	888,459	[1]	862,551
Total Commercial [Member]
By delinquency status:
Nonaccrual loans	2,522		2,239
Purchased Credit Impaired Loans	873		1,507	$ 18,700
Loans	438,022		414,826
Commercial and Industrial Loans [Member]
By delinquency status:
Nonaccrual loans	1,079		538
Purchased Credit Impaired Loans	86		75
Loans	284,817		271,795
Commercial Real Estate Mortgage [Member]
By delinquency status:
Nonaccrual loans	1,250		1,490
Purchased Credit Impaired Loans	681		1,261
Loans	119,695		111,996
Commercial Real Estate Construction [Member]
By delinquency status:
Nonaccrual loans	165		187
Purchased Credit Impaired Loans	106		171
Loans	21,309		18,728
Lease Financing [Member]
By delinquency status:
Nonaccrual loans	28		24
Purchased Credit Impaired Loans	0		0
Loans	12,201		12,307
Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Commercial [Member]
By delinquency status:
Current-29 DPD and still accruing	433,546		410,252
30-89 DPD and still accruing	1,054		781
90+ DPD and still accruing	27		47
Nonaccrual loans	2,522		2,239
Loans, excluding Purchased Credit Impaired Loans	437,149		413,319
Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial and Industrial Loans [Member]
By delinquency status:
Current-29 DPD and still accruing	283,047		270,624
30-89 DPD and still accruing	588		527
90+ DPD and still accruing	17		31
Nonaccrual loans	1,079		538
Loans, excluding Purchased Credit Impaired Loans	284,731		271,720
Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial Real Estate Mortgage [Member]
By delinquency status:
Current-29 DPD and still accruing	117,416		109,032
30-89 DPD and still accruing	338		197
90+ DPD and still accruing	10		16
Nonaccrual loans	1,250		1,490
Loans, excluding Purchased Credit Impaired Loans	119,014		110,735
Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial Real Estate Construction [Member]
By delinquency status:
Current-29 DPD and still accruing	20,930		18,345
30-89 DPD and still accruing	108		25
90+ DPD and still accruing	0		0
Nonaccrual loans	165		187
Loans, excluding Purchased Credit Impaired Loans	21,203		18,557
Loans Excluding Purchased Credit-Impaired Loans [Member] | Lease Financing [Member]
By delinquency status:
Current-29 DPD and still accruing	12,153		12,251
30-89 DPD and still accruing	20		32
90+ DPD and still accruing	0		0
Nonaccrual loans	28		24
Loans, excluding Purchased Credit Impaired Loans	$ 12,201		$ 12,307

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