Fee-based Revenue from Contracts with Customers (Noninterest Income Disaggregation By Business Segment) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Revenue from Contract with Customer [Abstract]
Number of reportable segments | segment	3
Disaggregation of Revenue [Line Items]
Noninterest income	$ 7,574	$ 8,106	$ 8,564
Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	5,695	5,710	5,758
Out-of-scope noninterest income	1,698	1,814	1,808
Other Segments
Disaggregation of Revenue [Line Items]
Noninterest income	181	582	998
Asset management and brokerage
Disaggregation of Revenue [Line Items]
Noninterest income	1,412	1,444	1,438
Card and cash management
Disaggregation of Revenue [Line Items]
Noninterest income	2,733	2,633	2,398
Lending and deposit services
Disaggregation of Revenue [Line Items]
Noninterest income	1,233	1,134	1,102
Residential and commercial mortgage
Disaggregation of Revenue [Line Items]
Noninterest income	625	647	850
Capital markets and advisory
Disaggregation of Revenue [Line Items]
Noninterest income	952	1,296	1,577
Retail Banking | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	2,457	2,422	2,285
Out-of-scope noninterest income	494	545	511
Noninterest income	2,951	2,967	2,796
Retail Banking | Asset management and brokerage | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	523	528	464
Retail Banking | Asset management fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income
Retail Banking | Brokerage fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	523	528	464
Retail Banking | Card and cash management | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	1,224	1,244	1,221
Retail Banking | Treasury management fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	41	40	46
Retail Banking | Debit card fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	691	684	665
Retail Banking | Net credit card fees | In-Scope Retail Banking Noninterest Income
Disaggregation of Revenue [Line Items]
Interchange fees	673	662	582
Credit card reward costs	445	425	361
Retail Banking | Net credit card fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	228	237	221
Retail Banking | Merchant services | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	168	186	174
Retail Banking | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	96	97	115
Retail Banking | Lending and deposit services | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	710	650	600
Retail Banking | Deposit account fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	637	583	542
Retail Banking | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	73	67	58
Corporate & Institutional Banking | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	2,349	2,372	2,500
Out-of-scope noninterest income	1,188	1,249	1,283
Noninterest income	3,537	3,621	3,783
Corporate & Institutional Banking | Asset management and brokerage | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income
Corporate & Institutional Banking | Asset management fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income
Corporate & Institutional Banking | Brokerage fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income
Corporate & Institutional Banking | Card and cash management | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	1,454	1,350	1,159
Corporate & Institutional Banking | Treasury management fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	1,377	1,284	1,097
Corporate & Institutional Banking | Debit card fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income
Corporate & Institutional Banking | Net credit card fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income
Corporate & Institutional Banking | Merchant services | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	77	66	62
Corporate & Institutional Banking | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income
Corporate & Institutional Banking | Lending and deposit services | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	34	33	40
Corporate & Institutional Banking | Deposit account fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income
Corporate & Institutional Banking | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	34	33	40
Corporate & Institutional Banking | Residential and commercial mortgage | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	140	140	141
Corporate & Institutional Banking | Capital markets and advisory | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	653	790	1,110
Corporate & Institutional Banking | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	68	59	50
Asset Management Group | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	889	916	973
Out-of-scope noninterest income	16	20	14
Noninterest income	905	936	987
Asset Management Group | Asset management and brokerage | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	889	916	973
Asset Management Group | Asset management fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	882	908	964
Asset Management Group | Brokerage fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	7	8	9
Asset Management Group | Card and cash management | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income
Asset Management Group | Treasury management fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income
Asset Management Group | Debit card fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income
Asset Management Group | Net credit card fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income
Asset Management Group | Merchant services | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income
Asset Management Group | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income
Asset Management Group | Lending and deposit services | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income
Asset Management Group | Deposit account fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income
Asset Management Group | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income