Segment Reporting - Schedule of Business Segment Results (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Net interest income	$ 3,476	$ 3,264
Noninterest income	1,976	1,881
Total revenue	5,452	5,145
Provision for (recapture of) credit losses	219	155
Noninterest Expense
Personnel	1,890	1,794
Depreciation and amortization	90	37
Total noninterest expense	3,387	3,334
Income before income taxes and noncontrolling interests	1,846	1,656
Income taxes	347	312
Net income	1,499	1,344
Less: Net income attributable to noncontrolling interests	18	14
Average Assets	556,377	562,848
Operating Segments
Segment Reporting Information [Line Items]
Total revenue	6,565	6,176
Noninterest Expense
Total noninterest expense	3,138	3,024
Net income	2,482	2,316
Average Assets	356,742	359,625
Retail Banking | Operating Segments
Segment Reporting Information [Line Items]
Net interest income	2,826	2,617
Noninterest income	706	764
Total revenue	3,532	3,381
Provision for (recapture of) credit losses	168	118
Noninterest Expense
Personnel	548	551
Segment allocations	938	894
Depreciation and amortization	89	79
Other	328	313
Total noninterest expense	1,903	1,837
Income before income taxes and noncontrolling interests	1,461	1,426
Income taxes	340	333
Net income	1,121	1,093
Less: Net income attributable to noncontrolling interests	9	8
Net income	1,112	1,085
Average Assets	112,971	114,199
Corporate & Institutional Banking | Operating Segments
Segment Reporting Information [Line Items]
Net interest income	1,628	1,520
Noninterest income	978	888
Total revenue	2,606	2,408
Provision for (recapture of) credit losses	49	47
Noninterest Expense
Personnel	376	366
Segment allocations	383	366
Depreciation and amortization	51	50
Other	146	140
Total noninterest expense	956	922
Income before income taxes and noncontrolling interests	1,601	1,439
Income taxes	353	313
Net income	1,248	1,126
Less: Net income attributable to noncontrolling interests	4	5
Net income	1,244	1,121
Average Assets	227,069	228,698
Asset Management Group | Operating Segments
Segment Reporting Information [Line Items]
Net interest income	184	157
Noninterest income	243	230
Total revenue	427	387
Provision for (recapture of) credit losses	1	(5)
Noninterest Expense
Personnel	121	121
Segment allocations	117	107
Depreciation and amortization	8	7
Other	33	30
Total noninterest expense	279	265
Income before income taxes and noncontrolling interests	147	127
Income taxes	34	30
Net income	113	97
Less: Net income attributable to noncontrolling interests	0	0
Net income	113	97
Average Assets	$ 16,702	$ 16,728