Segment Reporting (Table) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Net interest income	$ 2,466	$ 2,345	$ 7,240	$ 6,763
Noninterest income	1,891	1,780	5,552	5,306
Total revenue	4,357	4,125	12,792	12,069
Provision for credit losses (benefit)	88	130	260	316
Depreciation and amortization	224	229	694	686
Other noninterest expense	2,384	2,227	7,025	6,651
Income before income taxes and noncontrolling interests	1,661	1,539	4,813	4,416
Income taxes (benefit)	261	413	818	1,119
Net income	1,400	1,126	3,995	3,297
Average Assets	377,877	373,397	376,599	370,064
Retail Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	1,305	1,177	3,800	3,436
Noninterest income	622	643	1,935	1,891
Total revenue	1,927	1,820	5,735	5,327
Provision for credit losses (benefit)	113	77	254	198
Depreciation and amortization	52	43	144	132
Other noninterest expense	1,390	1,332	4,143	3,928
Income before income taxes and noncontrolling interests	372	368	1,194	1,069
Income taxes (benefit)	89	136	285	394
Net income	283	232	909	675
Average Assets	89,963	88,642	89,259	88,589
Corporate & Institutional Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	903	883	2,641	2,538
Noninterest income	592	555	1,774	1,667
Total revenue	1,495	1,438	4,415	4,205
Provision for credit losses (benefit)	(13)	62	43	174
Depreciation and amortization	47	47	140	137
Other noninterest expense	622	552	1,794	1,648
Income before income taxes and noncontrolling interests	839	777	2,438	2,246
Income taxes (benefit)	174	252	514	719
Net income	665	525	1,924	1,527
Average Assets	153,897	150,948	153,149	147,299
Asset Management Group [Member]
Segment Reporting Information [Line Items]
Net interest income	71	72	217	216
Noninterest income	228	220	676	655
Total revenue	299	292	893	871
Provision for credit losses (benefit)	2	3	2	(6)
Depreciation and amortization	13	13	38	38
Other noninterest expense	204	201	620	608
Income before income taxes and noncontrolling interests	80	75	233	231
Income taxes (benefit)	19	28	55	85
Net income	61	47	178	146
Average Assets	7,397	7,464	7,455	7,499
BlackRock [Member]
Segment Reporting Information [Line Items]
Noninterest income	265	206	732	578
Total revenue	265	206	732	578
Income before income taxes and noncontrolling interests	265	206	732	578
Income taxes (benefit)	49	49	124	132
Net income	216	157	608	446
Average Assets	7,964	7,282	7,964	7,282
Other [Member]
Segment Reporting Information [Line Items]
Net interest income	187	213	582	573
Noninterest income	184	156	435	515
Total revenue	371	369	1,017	1,088
Provision for credit losses (benefit)	(14)	(12)	(39)	(50)
Depreciation and amortization	112	126	372	379
Other noninterest expense	168	142	468	467
Income before income taxes and noncontrolling interests	105	113	216	292
Income taxes (benefit)	(70)	(52)	(160)	(211)
Net income	175	165	376	503
Average Assets	$ 118,656	$ 119,061	$ 118,772	$ 119,395