Business Segments (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment results and reconciliation
Noninterest revenue	$ 50,571	$ 53,287	$ 52,121
Net interest income	43,634	43,319	44,910
Total net revenue	94,205	96,606	97,031
Provision for credit losses	3,139	225	3,385
Noninterest expense	61,274	70,467	64,729
Income before income tax expense	29,792	25,914	28,917
Income tax expense/(benefit)	8,030	7,991	7,633
Net income	21,762	17,923	21,284
Average common equity	207,400	196,409	184,352
Assets	2,573,126	2,415,689	2,359,141
Return on average common equity	10.00%	9.00%	11.00%
Overhead ratio	65.00%	73.00%	67.00%
Operating Segments | Consumer & Community Banking
Segment results and reconciliation
Noninterest revenue	15,937	17,552	20,813
Net interest income	28,431	28,985	29,465
Total net revenue	44,368	46,537	50,278
Provision for credit losses	3,520	335	3,774
Noninterest expense	25,609	27,842	28,827
Income before income tax expense	15,239	18,360	17,677
Income tax expense/(benefit)	6,054	7,299	6,886
Net income	9,185	11,061	10,791
Average common equity	51,000	46,000	43,000
Assets	455,634	452,929	467,282
Return on average common equity	18.00%	23.00%	25.00%
Overhead ratio	58.00%	60.00%	57.00%
Operating Segments | Corporate & Investment Bank
Segment results and reconciliation
Noninterest revenue	23,458	23,810	23,104
Net interest income	11,175	10,976	11,658
Total net revenue	34,633	34,786	34,762
Provision for credit losses	(161)	(232)	(479)
Noninterest expense	23,273	21,744	21,850
Income before income tax expense	11,521	13,274	13,391
Income tax expense/(benefit)	4,596	4,387	4,719
Net income	6,925	8,887	8,672
Average common equity	61,000	56,500	47,500
Assets	861,819	843,577	876,107
Return on average common equity	10.00%	15.00%	18.00%
Overhead ratio	67.00%	63.00%	63.00%
Operating Segments | Commercial Banking
Segment results and reconciliation
Noninterest revenue	2,349	2,298	2,283
Net interest income	4,533	4,794	4,629
Total net revenue	6,882	7,092	6,912
Provision for credit losses	(189)	85	41
Noninterest expense	2,695	2,610	2,389
Income before income tax expense	4,376	4,397	4,482
Income tax expense/(benefit)	1,741	1,749	1,783
Net income	2,635	2,648	2,699
Average common equity	14,000	13,500	9,500
Assets	195,267	190,782	181,502
Return on average common equity	18.00%	19.00%	28.00%
Overhead ratio	39.00%	37.00%	35.00%
Operating Segments | Asset Management
Segment results and reconciliation
Noninterest revenue	9,588	9,029	7,847
Net interest income	2,440	2,376	2,163
Total net revenue	12,028	11,405	10,010
Provision for credit losses	4	65	86
Noninterest expense	8,538	8,016	7,104
Income before income tax expense	3,486	3,324	2,820
Income tax expense/(benefit)	1,333	1,241	1,078
Net income	2,153	2,083	1,742
Average common equity	9,000	9,000	7,000
Assets	128,701	122,414	108,999
Return on average common equity	23.00%	23.00%	24.00%
Overhead ratio	71.00%	70.00%	71.00%
Operating Segments | Corporate
Segment results and reconciliation
Noninterest revenue	1,972	3,093	190
Net interest income	(1,960)	(3,115)	(2,262)
Total net revenue	12	(22)	(2,072)
Provision for credit losses	(35)	(28)	(37)
Noninterest expense	1,159	10,255	4,559
Income before income tax expense	(1,112)	(10,249)	(6,594)
Income tax expense/(benefit)	(1,976)	(3,493)	(3,974)
Net income	864	(6,756)	(2,620)
Average common equity	72,400	71,409	77,352
Assets	931,705	805,987	725,251
Reconciling Items
Segment results and reconciliation
Noninterest revenue	(2,733)	(2,495)	(2,116)
Net interest income	(985)	(697)	(743)
Total net revenue	(3,718)	(3,192)	(2,859)
Provision for credit losses	0	0	0
Noninterest expense	0	0	0
Income before income tax expense	(3,718)	(3,192)	(2,859)
Income tax expense/(benefit)	(3,718)	(3,192)	(2,859)
Net income	0	0	0
Average common equity	$ 0	$ 0	$ 0