Segment Reporting (Segment Reporting Table) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Net interest income	$ 2,475	$ 2,361
Noninterest income	1,811	1,750
Total revenue	4,286	4,111
Provision for credit losses (benefit)	189	92
Depreciation and amortization	234	233
Other noninterest expense	2,344	2,294
Income before income taxes and noncontrolling interests	1,519	1,492
Income taxes (benefit)	248	253
Net income	1,271	1,239
Average Assets	385,898	376,275
Retail Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	1,349	1,218
Noninterest income	595	635
Total revenue	1,944	1,853
Provision for credit losses (benefit)	128	69
Depreciation and amortization	51	45
Other noninterest expense	1,417	1,411
Income before income taxes and noncontrolling interests	348	328
Income taxes (benefit)	84	79
Net income	264	249
Average Assets	91,255	88,734
Corporate & Institutional Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	877	861
Noninterest income	576	547
Total revenue	1,453	1,408
Provision for credit losses (benefit)	71	41
Depreciation and amortization	50	48
Other noninterest expense	636	605
Income before income taxes and noncontrolling interests	696	714
Income taxes (benefit)	144	151
Net income	552	563
Average Assets	157,169	151,909
Asset Management Group [Member]
Segment Reporting Information [Line Items]
Net interest income	70	74
Noninterest income	217	226
Total revenue	287	300
Provision for credit losses (benefit)	(1)	(7)
Depreciation and amortization	12	12
Other noninterest expense	218	213
Income before income taxes and noncontrolling interests	58	82
Income taxes (benefit)	13	20
Net income	45	62
Average Assets	7,259	7,499
BlackRock [Member]
Segment Reporting Information [Line Items]
Noninterest income	233	235
Total revenue	233	235
Income before income taxes and noncontrolling interests	233	235
Income taxes (benefit)	36	38
Net income	197	197
Average Assets	8,080	7,704
Other [Member]
Segment Reporting Information [Line Items]
Net interest income	179	208
Noninterest income	190	107
Total revenue	369	315
Provision for credit losses (benefit)	(9)	(11)
Depreciation and amortization	121	128
Other noninterest expense	73	65
Income before income taxes and noncontrolling interests	184	133
Income taxes (benefit)	(29)	(35)
Net income	213	168
Average Assets	$ 122,135	$ 120,429