Segment Reporting (Table) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Net interest income	$ 2,345	$ 2,095	$ 6,763	$ 6,261
Noninterest income	1,780	1,734	5,306	5,027
Total revenue	4,125	3,829	12,069	11,288
Provision for credit losses (benefit)	130	87	316	366
Depreciation and amortization	229	209	686	626
Other noninterest expense	2,227	2,185	6,651	6,409
Income before income taxes and noncontrolling interests	1,539	1,348	4,416	3,887
Income taxes (benefit)	413	342	1,119	949
Net income	1,126	1,006	3,297	2,938
Average Assets	373,397	363,870	370,064	359,607
Retail Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	1,177	1,135	3,436	3,389
Noninterest income	643	680	1,891	2,038
Total revenue	1,820	1,815	5,327	5,427
Provision for credit losses (benefit)	77	102	198	210
Depreciation and amortization	43	44	132	132
Other noninterest expense	1,332	1,315	3,928	3,831
Income before income taxes and noncontrolling interests	368	354	1,069	1,254
Income taxes (benefit)	136	130	394	459
Net income	232	224	675	795
Inter-segment revenue
Average Assets	88,642	85,789	88,589	85,783
Corporate & Institutional Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	883	793	2,538	2,351
Noninterest income	555	526	1,667	1,506
Total revenue	1,438	1,319	4,205	3,857
Provision for credit losses (benefit)	62	8	174	180
Depreciation and amortization	47	36	137	110
Other noninterest expense	552	529	1,648	1,545
Income before income taxes and noncontrolling interests	777	746	2,246	2,022
Income taxes (benefit)	252	237	719	658
Net income	525	509	1,527	1,364
Inter-segment revenue
Average Assets	150,948	141,550	147,299	139,632
Asset Management Group [Member]
Segment Reporting Information [Line Items]
Net interest income	72	74	216	227
Noninterest income	220	220	655	636
Total revenue	292	294	871	863
Provision for credit losses (benefit)	3	(3)	(6)
Depreciation and amortization	13	11	38	34
Other noninterest expense	201	195	608	584
Income before income taxes and noncontrolling interests	75	91	231	245
Income taxes (benefit)	28	33	85	90
Net income	47	58	146	155
Inter-segment revenue
Average Assets	7,464	7,588	7,499	7,743
BlackRock [Member]
Segment Reporting Information [Line Items]
Noninterest income	206	189	578	500
Total revenue	206	189	578	500
Income before income taxes and noncontrolling interests	206	189	578	500
Income taxes (benefit)	49	41	132	110
Net income	157	148	446	390
Inter-segment revenue
Average Assets	7,282	7,026	7,282	7,026
Other [Member]
Segment Reporting Information [Line Items]
Net interest income	213	93	573	294
Noninterest income	156	119	515	347
Total revenue	369	212	1,088	641
Provision for credit losses (benefit)	(12)	(20)	(50)	(24)
Depreciation and amortization	126	118	379	350
Other noninterest expense	142	146	467	449
Income before income taxes and noncontrolling interests	113	(32)	292	(134)
Income taxes (benefit)	(52)	(99)	(211)	(368)
Net income	165	67	503	234
Inter-segment revenue
Average Assets	$ 119,061	$ 121,917	$ 119,395	$ 119,423