Fee-Based Revenue from Contracts with Customers (Noninterest Income by Business Segment and Reconciliation to Consolidated Noninterest Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Total noninterest income	$ 1,976	$ 1,881
Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	1,515	1,438
Out-of-scope noninterest income	412	444
Segment Reporting, Reconciling Item, Corporate Nonsegment
Disaggregation of Revenue [Line Items]
Total noninterest income	49	(1)
Retail Banking 1 [Member] | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	605	589
Out-of-scope noninterest income	101	175
Total noninterest income	706	764
Retail Banking 1 [Member] | Asset management and brokerage | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	152	137
Retail Banking 1 [Member] | Brokerage fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	152	137
Retail Banking 1 [Member] | Card and cash management | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	275	281
Retail Banking 1 [Member] | Treasury management fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	10	10
Retail Banking 1 [Member] | Debit card fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	169	167
Retail Banking 1 [Member] | Net credit card fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	41	45
Retail Banking 1 [Member] | Interchange Fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	162	158
Retail Banking 1 [Member] | Credit Card Reward Costs | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	121	113
Retail Banking 1 [Member] | Merchant services | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	35	37
Retail Banking 1 [Member] | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	20	22
Retail Banking 1 [Member] | Lending and deposit services | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	178	171
Retail Banking 1 [Member] | Deposit account fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	161	155
Retail Banking 1 [Member] | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	17	16
Corporate & Institutional Banking [Member] | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	671	622
Out-of-scope noninterest income	307	266
Total noninterest income	978	888
Corporate & Institutional Banking [Member] | Card and cash management | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	407	376
Corporate & Institutional Banking [Member] | Treasury management fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	390	357
Corporate & Institutional Banking [Member] | Merchant services | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	17	19
Corporate & Institutional Banking [Member] | Lending and deposit services | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	7	9
Corporate & Institutional Banking [Member] | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	7	9
Corporate & Institutional Banking [Member] | Residential and commercial mortgage | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	29	30
Corporate & Institutional Banking [Member] | Capital markets and advisory | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	217	190
Corporate & Institutional Banking [Member] | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	11	17
Asset Management Group [Member] | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	239	227
Out-of-scope noninterest income	4	3
Total noninterest income	243	230
Asset Management Group [Member] | Asset management and brokerage | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	239	227
Asset Management Group [Member] | Asset management fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	$ 239	227
Asset Management Group [Member] | Brokerage fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income		$ 0