Segment Reporting (Table) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Net interest income	$ 2,413	$ 2,258	$ 4,774	$ 4,418
Noninterest income	1,911	1,802	3,661	3,526
Total revenue	4,324	4,060	8,435	7,944
Provision for credit losses (benefit)	80	98	172	186
Depreciation and amortization	237	243	470	457
Other Noninterest Expense Excluding Depreciation And Amortization	2,347	2,236	4,641	4,424
Income before income taxes and noncontrolling interests	1,660	1,483	3,152	2,877
Income taxes (benefit)	304	386	557	706
Net income	1,356	1,097	2,595	2,171
Segment Reporting Average Assets	375,627	370,302	375,949	368,370
Retail Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	1,277	1,139	2,495	2,259
Noninterest income	678	645	1,313	1,248
Total revenue	1,955	1,784	3,808	3,507
Provision for credit losses (benefit)	72	50	141	121
Depreciation and amortization	47	47	92	89
Other Noninterest Expense Excluding Depreciation And Amortization	1,403	1,323	2,753	2,596
Income before income taxes and noncontrolling interests	433	364	822	701
Income taxes (benefit)	103	134	196	258
Net income	330	230	626	443
Segment Reporting Average Assets	89,021	88,671	88,879	88,559
Corporate & Institutional Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	877	853	1,738	1,655
Noninterest income	635	588	1,182	1,112
Total revenue	1,512	1,441	2,920	2,767
Provision for credit losses (benefit)	15	87	56	112
Depreciation and amortization	45	54	93	90
Other Noninterest Expense Excluding Depreciation And Amortization	594	548	1,172	1,096
Income before income taxes and noncontrolling interests	858	752	1,599	1,469
Income taxes (benefit)	183	234	340	467
Net income	675	518	1,259	1,002
Segment Reporting Average Assets	153,619	148,267	152,769	145,445
Asset Management Group [Member]
Segment Reporting Information [Line Items]
Net interest income	72	73	146	144
Noninterest income	222	217	448	435
Total revenue	294	290	594	579
Provision for credit losses (benefit)	7	(7)		(9)
Depreciation and amortization	13	14	25	25
Other Noninterest Expense Excluding Depreciation And Amortization	210	201	416	407
Income before income taxes and noncontrolling interests	64	82	153	156
Income taxes (benefit)	15	30	36	57
Net income	49	52	117	99
Segment Reporting Average Assets	7,469	7,516	7,484	7,517
BlackRock [Member]
Segment Reporting Information [Line Items]
Noninterest income	232	186	467	372
Total revenue	232	186	467	372
Income before income taxes and noncontrolling interests	232	186	467	372
Income taxes (benefit)	37	42	75	83
Net income	195	144	392	289
Segment Reporting Average Assets	7,811	7,132	7,811	7,132
Other [Member]
Segment Reporting Information [Line Items]
Net interest income	187	193	395	360
Noninterest income	144	166	251	359
Total revenue	331	359	646	719
Provision for credit losses (benefit)	(14)	(32)	(25)	(38)
Depreciation and amortization	132	128	260	253
Other Noninterest Expense Excluding Depreciation And Amortization	140	164	300	325
Income before income taxes and noncontrolling interests	73	99	111	179
Income taxes (benefit)	(34)	(54)	(90)	(159)
Net income	107	153	201	338
Segment Reporting Average Assets	$ 117,707	$ 118,716	$ 119,006	$ 119,717