Segment Reporting (Table) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Net interest income	$ 2,361	$ 2,160
Noninterest income	1,750	1,724
Total revenue	4,111	3,884
Provision for credit losses (benefit)	92	88
Depreciation and amortization	233	214
Other Noninterest Expense Excluding Depreciation And Amortization	2,294	2,188
Income before income taxes and noncontrolling interests	1,492	1,394
Income taxes (benefit)	253	320
Net income	1,239	1,074
Segment Reporting Average Assets	376,275	366,416
Retail Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	1,218	1,120
Noninterest income	635	603
Total revenue	1,853	1,723
Provision for credit losses (benefit)	69	71
Depreciation and amortization	45	42
Other Noninterest Expense Excluding Depreciation And Amortization	1,350	1,273
Income before income taxes and noncontrolling interests	389	337
Income taxes (benefit)	93	124
Net income	296	213
Segment Reporting Average Assets	88,734	87,109
Corporate & Institutional Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	861	802
Noninterest income	547	524
Total revenue	1,408	1,326
Provision for credit losses (benefit)	41	25
Depreciation and amortization	48	36
Other Noninterest Expense Excluding Depreciation And Amortization	578	548
Income before income taxes and noncontrolling interests	741	717
Income taxes (benefit)	157	233
Net income	584	484
Segment Reporting Average Assets	151,909	142,592
Asset Management Group [Member]
Segment Reporting Information [Line Items]
Net interest income	74	71
Noninterest income	226	218
Total revenue	300	289
Provision for credit losses (benefit)	(7)	(2)
Depreciation and amortization	12	11
Other Noninterest Expense Excluding Depreciation And Amortization	206	206
Income before income taxes and noncontrolling interests	89	74
Income taxes (benefit)	21	27
Net income	68	47
Segment Reporting Average Assets	7,499	7,476
BlackRock [Member]
Segment Reporting Information [Line Items]
Noninterest income	235	186
Total revenue	235	186
Income before income taxes and noncontrolling interests	235	186
Income taxes (benefit)	38	41
Net income	197	145
Segment Reporting Average Assets	7,704	6,983
Other [Member]
Segment Reporting Information [Line Items]
Net interest income	208	167
Noninterest income	107	193
Total revenue	315	360
Provision for credit losses (benefit)	(11)	(6)
Depreciation and amortization	128	125
Other Noninterest Expense Excluding Depreciation And Amortization	160	161
Income before income taxes and noncontrolling interests	38	80
Income taxes (benefit)	(56)	(105)
Net income	94	185
Segment Reporting Average Assets	$ 120,429	$ 122,256