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		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Noninterest income	$ 1,815	$ 2,074	$ 5,616	$ 6,027
Total in-scope noninterest income
Disaggregation of Revenue [Line Items]
Noninterest income	1,398	1,390	4,177	4,243
Out-of-Scope
Disaggregation of Revenue [Line Items]
Noninterest income	444	453	1,275	1,347
Other
Disaggregation of Revenue [Line Items]
Noninterest income	94	317	481	705
Retail Banking
Disaggregation of Revenue [Line Items]
Noninterest income	784	725	2,229	2,218
Retail Banking | Asset management and brokerage
Disaggregation of Revenue [Line Items]
Noninterest income	129	131	383	400
Retail Banking | Card and cash management
Disaggregation of Revenue [Line Items]
Noninterest income	305	317	921	935
Retail Banking | Lending and deposit services
Disaggregation of Revenue [Line Items]
Noninterest income	188	162	530	483
Retail Banking | Total in-scope noninterest income
Disaggregation of Revenue [Line Items]
Noninterest income	622	610	1,834	1,818
Retail Banking | Out-of-Scope
Disaggregation of Revenue [Line Items]
Noninterest income	162	115	395	400
Retail Banking | Brokerage fees | Asset management and brokerage
Disaggregation of Revenue [Line Items]
Noninterest income	129	131	383	400
Retail Banking | Treasury management fees | Card and cash management
Disaggregation of Revenue [Line Items]
Noninterest income	10	11	31	30
Retail Banking | Debit card fees | Card and cash management
Disaggregation of Revenue [Line Items]
Noninterest income	175	175	518	513
Retail Banking | Net credit card fees | Card and cash management
Disaggregation of Revenue [Line Items]
Noninterest income	54	60	173	178
Retail Banking | Merchant services | Card and cash management
Disaggregation of Revenue [Line Items]
Noninterest income	42	48	126	141
Retail Banking | Other | Card and cash management
Disaggregation of Revenue [Line Items]
Noninterest income	24	23	73	73
Retail Banking | Deposit account fees | Lending and deposit services
Disaggregation of Revenue [Line Items]
Noninterest income	170	146	476	433
Retail Banking | Other | Lending and deposit services
Disaggregation of Revenue [Line Items]
Noninterest income	18	16	54	50
Retail Banking | Net credit card fees | In-Scope
Disaggregation of Revenue [Line Items]
Interchange fees	169	169	502	489
Credit card reward costs	115	109	329	311
Corporate & Institutional Banking
Disaggregation of Revenue [Line Items]
Noninterest income	835	887	2,542	2,659
Corporate & Institutional Banking | Card and cash management
Disaggregation of Revenue [Line Items]
Noninterest income	371	344	1,082	1,004
Corporate & Institutional Banking | Lending and deposit services
Disaggregation of Revenue [Line Items]
Noninterest income	8	8	24	25
Corporate & Institutional Banking | Total in-scope noninterest income
Disaggregation of Revenue [Line Items]
Noninterest income	557	554	1,674	1,726
Corporate & Institutional Banking | Out-of-Scope
Disaggregation of Revenue [Line Items]
Noninterest income	278	333	868	933
Corporate & Institutional Banking | Treasury management fees | Card and cash management
Disaggregation of Revenue [Line Items]
Noninterest income	351	328	1,024	957
Corporate & Institutional Banking | Merchant services | Card and cash management
Disaggregation of Revenue [Line Items]
Noninterest income	20	16	58	47
Corporate & Institutional Banking | Other | Lending and deposit services
Disaggregation of Revenue [Line Items]
Noninterest income	8	8	24	25
Corporate & Institutional Banking | Residential and commercial mortgage
Disaggregation of Revenue [Line Items]
Noninterest income	32	36	114	100
Corporate & Institutional Banking | Capital markets and advisory
Disaggregation of Revenue [Line Items]
Noninterest income	124	155	410	564
Corporate & Institutional Banking | Other
Disaggregation of Revenue [Line Items]
Noninterest income	22	11	44	33
Asset Management Group
Disaggregation of Revenue [Line Items]
Noninterest income	223	231	681	713
Asset Management Group | Asset management and brokerage
Disaggregation of Revenue [Line Items]
Noninterest income	219	226	669	699
Asset Management Group | Total in-scope noninterest income
Disaggregation of Revenue [Line Items]
Noninterest income	219	226	669	699
Asset Management Group | Out-of-Scope
Disaggregation of Revenue [Line Items]
Noninterest income	4	5	12	14
Asset Management Group | Asset management fees | Asset management and brokerage
Disaggregation of Revenue [Line Items]
Noninterest income	217	224	663	693
Asset Management Group | Brokerage fees | Asset management and brokerage
Disaggregation of Revenue [Line Items]
Noninterest income	2	2	6	6
Other
Disaggregation of Revenue [Line Items]
Noninterest income	$ (27)	$ 231	$ 164	$ 437