Fee-based Revenue from Contracts with Customers (Noninterest Income Disaggregation By Business Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Total noninterest income	$ 8,056	$ 7,574	$ 8,106
Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	6,044	5,695	5,710
Out-of-scope noninterest income	2,414	1,698	1,814
Segment Reporting, Reconciling Item, Corporate Nonsegment
Disaggregation of Revenue [Line Items]
Total noninterest income	(402)	181	582
Retail Banking | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	2,443	2,457	2,422
Out-of-scope noninterest income	1,139	494	545
Total noninterest income	3,582	2,951	2,967
Retail Banking | Asset Management Fees And Brokerage Fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	551	523	528
Retail Banking | Brokerage fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	551	523	528
Retail Banking | Total card and cash management | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	1,173	1,224	1,244
Retail Banking | Treasury management fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	41	41	40
Retail Banking | Debit card fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	699	691	684
Retail Banking | Net credit card fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	189	228	237
Retail Banking | Merchant services | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	157	168	186
Retail Banking | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	87	96	97
Retail Banking | Lending and deposit services | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	719	710	650
Retail Banking | Deposit account fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	645	637	583
Retail Banking | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	74	73	67
Retail Banking | Interchange Fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	671	673	662
Retail Banking | Credit Card Reward Costs | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	482	445	425
Corporate & Institutional Banking | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	2,667	2,349	2,372
Out-of-scope noninterest income	1,260	1,188	1,249
Total noninterest income	3,927	3,537	3,621
Corporate & Institutional Banking | Total card and cash management | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	1,555	1,454	1,350
Corporate & Institutional Banking | Treasury management fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	1,481	1,377	1,284
Corporate & Institutional Banking | Merchant services | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	74	77	66
Corporate & Institutional Banking | Lending and deposit services | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	32	34	33
Corporate & Institutional Banking | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	32	34	33
Corporate & Institutional Banking | Residential and commercial mortgage | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	117	140	140
Corporate & Institutional Banking | Capital markets and advisory | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	888	653	790
Corporate & Institutional Banking | Total other income | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	75	68	59
Asset Management Group | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	934	889	916
Out-of-scope noninterest income	15	16	20
Total noninterest income	949	905	936
Asset Management Group | Asset Management Fees And Brokerage Fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	934	889	916
Asset Management Group | Asset management fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	933	882	908
Asset Management Group | Brokerage fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	$ 1	$ 7	$ 8