Segment Reporting (Results of Business) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net interest income	$ 9,946	$ 9,965	$ 9,721
Noninterest income	6,955	6,874	6,469
Total revenue	16,901	16,839	16,190
Provision for (recapture of) credit losses	3,175	773	408
Depreciation and amortization	983	1,035	940
Other noninterest expense	9,314	9,539	9,356
Income from continuing operations before income taxes and noncontrolling interests	3,429	5,492	5,486
Income taxes (benefit)	426	901	928
Net income from continuing operations	3,003	4,591	4,558
Less: Net income attributable to noncontrolling interests	41	49	45
Net income from continuing operations excluding noncontrolling interests	2,962	4,542	4,513
Average Assets	449,295	400,335	378,235
Retail Banking
Segment Reporting Information [Line Items]
Noninterest income	2,519	2,648	2,631
Retail Banking | Operating Segments
Segment Reporting Information [Line Items]
Net interest income	5,609	5,520	5,119
Noninterest income	2,519	2,648	2,631
Total revenue	8,128	8,168	7,750
Provision for (recapture of) credit losses	968	517	373
Depreciation and amortization	251	230	206
Other noninterest expense	5,768	5,781	5,724
Income from continuing operations before income taxes and noncontrolling interests	1,141	1,640	1,447
Income taxes (benefit)	266	377	335
Net income from continuing operations	875	1,263	1,112
Less: Net income attributable to noncontrolling interests	31	50	48
Net income from continuing operations excluding noncontrolling interests	844	1,213	1,064
Average Assets	97,643	92,959	89,739
Corporate & Institutional Banking
Segment Reporting Information [Line Items]
Noninterest income	3,062	2,537	2,406
Corporate & Institutional Banking | Operating Segments
Segment Reporting Information [Line Items]
Net interest income	3,999	3,637	3,551
Noninterest income	3,062	2,537	2,406
Total revenue	7,061	6,174	5,957
Provision for (recapture of) credit losses	2,088	284	85
Depreciation and amortization	197	198	186
Other noninterest expense	2,659	2,615	2,520
Income from continuing operations before income taxes and noncontrolling interests	2,117	3,077	3,166
Income taxes (benefit)	433	629	658
Net income from continuing operations	1,684	2,448	2,508
Less: Net income attributable to noncontrolling interests	10
Net income from continuing operations excluding noncontrolling interests	1,674	2,448	2,508
Average Assets	183,189	164,243	154,119
Asset Management Group
Segment Reporting Information [Line Items]
Noninterest income	854	991	892
Asset Management Group | Operating Segments
Segment Reporting Information [Line Items]
Net interest income	357	288	287
Noninterest income	854	991	892
Total revenue	1,211	1,279	1,179
Provision for (recapture of) credit losses	21	(1)	2
Depreciation and amortization	45	62	52
Other noninterest expense	813	877	861
Income from continuing operations before income taxes and noncontrolling interests	332	341	264
Income taxes (benefit)	77	79	62
Net income from continuing operations	255	262	202
Net income from continuing operations excluding noncontrolling interests	255	262	202
Average Assets	8,186	7,360	7,423
Other
Segment Reporting Information [Line Items]
Net interest income	(19)	520	764
Noninterest income	520	698	540
Total revenue	501	1,218	1,304
Provision for (recapture of) credit losses	98	(27)	(52)
Depreciation and amortization	490	545	496
Other noninterest expense	74	266	251
Income from continuing operations before income taxes and noncontrolling interests	(161)	434	609
Income taxes (benefit)	(350)	(184)	(127)
Net income from continuing operations	189	618	736
Less: Net income attributable to noncontrolling interests		(1)	(3)
Net income from continuing operations excluding noncontrolling interests	189	619	739
Average Assets	$ 160,277	$ 135,773	$ 126,954