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		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Noninterest income	$ 1,783	$ 2,065	$ 3,801	$ 3,953
Total in-scope noninterest income
Disaggregation of Revenue [Line Items]
Noninterest income	1,393	1,520	2,779	2,853
Out-of-Scope
Disaggregation of Revenue [Line Items]
Noninterest income	358	430	831	894
Other
Disaggregation of Revenue [Line Items]
Noninterest income	129	177	387	388
Retail Banking
Disaggregation of Revenue [Line Items]
Noninterest income	702	748	1,445	1,493
Retail Banking | Asset management and brokerage
Disaggregation of Revenue [Line Items]
Noninterest income	124	135	254	269
Retail Banking | Card and cash management
Disaggregation of Revenue [Line Items]
Noninterest income	320	329	616	618
Retail Banking | Lending and deposit services
Disaggregation of Revenue [Line Items]
Noninterest income	169	162	342	321
Retail Banking | Total in-scope noninterest income
Disaggregation of Revenue [Line Items]
Noninterest income	613	626	1,212	1,208
Retail Banking | Out-of-Scope
Disaggregation of Revenue [Line Items]
Noninterest income	89	122	233	285
Retail Banking | Brokerage fees | Asset management and brokerage
Disaggregation of Revenue [Line Items]
Noninterest income	124	135	254	269
Retail Banking | Treasury management fees | Card and cash management
Disaggregation of Revenue [Line Items]
Noninterest income	11	10	21	19
Retail Banking | Debit card fees | Card and cash management
Disaggregation of Revenue [Line Items]
Noninterest income	178	177	343	338
Retail Banking | Net credit card fees | Card and cash management
Disaggregation of Revenue [Line Items]
Noninterest income	61	63	119	118
Retail Banking | Merchant services | Card and cash management
Disaggregation of Revenue [Line Items]
Noninterest income	45	52	84	93
Retail Banking | Other | Card and cash management
Disaggregation of Revenue [Line Items]
Noninterest income	25	27	49	50
Retail Banking | Deposit account fees | Lending and deposit services
Disaggregation of Revenue [Line Items]
Noninterest income	151	145	306	287
Retail Banking | Other | Lending and deposit services
Disaggregation of Revenue [Line Items]
Noninterest income	18	17	36	34
Retail Banking | Net credit card fees | In-Scope
Disaggregation of Revenue [Line Items]
Interchange fees	173	172	333	320
Credit card reward costs	112	109	214	202
Corporate & Institutional Banking
Disaggregation of Revenue [Line Items]
Noninterest income	821	968	1,707	1,772
Corporate & Institutional Banking | Card and cash management
Disaggregation of Revenue [Line Items]
Noninterest income	364	341	711	660
Corporate & Institutional Banking | Lending and deposit services
Disaggregation of Revenue [Line Items]
Noninterest income	8	9	16	17
Corporate & Institutional Banking | Total in-scope noninterest income
Disaggregation of Revenue [Line Items]
Noninterest income	556	664	1,117	1,172
Corporate & Institutional Banking | Out-of-Scope
Disaggregation of Revenue [Line Items]
Noninterest income	265	304	590	600
Corporate & Institutional Banking | Treasury management fees | Card and cash management
Disaggregation of Revenue [Line Items]
Noninterest income	345	327	673	629
Corporate & Institutional Banking | Merchant services | Card and cash management
Disaggregation of Revenue [Line Items]
Noninterest income	19	14	38	31
Corporate & Institutional Banking | Other | Lending and deposit services
Disaggregation of Revenue [Line Items]
Noninterest income	8	9	16	17
Corporate & Institutional Banking | Residential and commercial mortgage
Disaggregation of Revenue [Line Items]
Noninterest income	40	33	82	64
Corporate & Institutional Banking | Capital markets and advisory
Disaggregation of Revenue [Line Items]
Noninterest income	130	272	286	409
Corporate & Institutional Banking | Other
Disaggregation of Revenue [Line Items]
Noninterest income	14	9	22	22
Asset Management Group
Disaggregation of Revenue [Line Items]
Noninterest income	228	234	458	482
Asset Management Group | Asset management and brokerage
Disaggregation of Revenue [Line Items]
Noninterest income	224	230	450	473
Asset Management Group | Total in-scope noninterest income
Disaggregation of Revenue [Line Items]
Noninterest income	224	230	450	473
Asset Management Group | Out-of-Scope
Disaggregation of Revenue [Line Items]
Noninterest income	4	4	8	9
Asset Management Group | Asset management fees | Asset management and brokerage
Disaggregation of Revenue [Line Items]
Noninterest income	222	228	446	469
Asset Management Group | Brokerage fees | Asset management and brokerage
Disaggregation of Revenue [Line Items]
Noninterest income	2	2	4	4
Other
Disaggregation of Revenue [Line Items]
Noninterest income	$ 32	$ 115	$ 191	$ 206