Fee-Based Revenue from Contracts with Customers (In-Scope Noninterest Income by Business Segment and Reconciliation to Consolidated Noninterest Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Noninterest income	$ 1,888	$ 1,872
Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Noninterest income	1,333	1,197
Out-of-Scope
Disaggregation of Revenue [Line Items]
Noninterest income	464	493
Other
Disaggregation of Revenue [Line Items]
Noninterest income	211	300
Retail Banking
Disaggregation of Revenue [Line Items]
Noninterest income	745	654
Retail Banking | Asset management & brokerage
Disaggregation of Revenue [Line Items]
Noninterest income	134	102
Retail Banking | Card & cash management
Disaggregation of Revenue [Line Items]
Noninterest income	289	251
Retail Banking | Lending & deposit services
Disaggregation of Revenue [Line Items]
Noninterest income	159	131
Retail Banking | Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Noninterest income	582	484
Retail Banking | Out-of-Scope
Disaggregation of Revenue [Line Items]
Noninterest income	163	170
Retail Banking | Brokerage fees | Asset management & brokerage
Disaggregation of Revenue [Line Items]
Noninterest income	134	102
Retail Banking | Treasury management fees | Card & cash management
Disaggregation of Revenue [Line Items]
Noninterest income	9	7
Retail Banking | Debit card fees | Card & cash management
Disaggregation of Revenue [Line Items]
Noninterest income	161	138
Retail Banking | Net credit card fees | Card & cash management
Disaggregation of Revenue [Line Items]
Noninterest income	55	47
Retail Banking | Merchant services | Card & cash management
Disaggregation of Revenue [Line Items]
Noninterest income	41	32
Retail Banking | Other | Card & cash management
Disaggregation of Revenue [Line Items]
Noninterest income	23	27
Retail Banking | Deposit account fees | Lending & deposit services
Disaggregation of Revenue [Line Items]
Noninterest income	142	119
Retail Banking | Other | Lending & deposit services
Disaggregation of Revenue [Line Items]
Noninterest income	17	12
Retail Banking | Net credit card fees | In-Scope
Disaggregation of Revenue [Line Items]
Interchange fees	148	120
Credit card reward costs	93	73
Corporate & Institutional Banking
Disaggregation of Revenue [Line Items]
Noninterest income	804	807
Corporate & Institutional Banking | Card & cash management
Disaggregation of Revenue [Line Items]
Noninterest income	319	235
Corporate & Institutional Banking | Lending & deposit services
Disaggregation of Revenue [Line Items]
Noninterest income	8	10
Corporate & Institutional Banking | Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Noninterest income	508	487
Corporate & Institutional Banking | Out-of-Scope
Disaggregation of Revenue [Line Items]
Noninterest income	296	320
Corporate & Institutional Banking | Treasury management fees | Card & cash management
Disaggregation of Revenue [Line Items]
Noninterest income	302	223
Corporate & Institutional Banking | Merchant services | Card & cash management
Disaggregation of Revenue [Line Items]
Noninterest income	17	12
Corporate & Institutional Banking | Other | Lending & deposit services
Disaggregation of Revenue [Line Items]
Noninterest income	8	10
Corporate & Institutional Banking | Residential and commercial mortgage
Disaggregation of Revenue [Line Items]
Noninterest income	31	31
Corporate & Institutional Banking | Capital markets related
Disaggregation of Revenue [Line Items]
Noninterest income	137	192
Corporate & Institutional Banking | Other
Disaggregation of Revenue [Line Items]
Noninterest income	13	19
Asset Management Group
Disaggregation of Revenue [Line Items]
Noninterest income	248	229
Asset Management Group | Asset management & brokerage
Disaggregation of Revenue [Line Items]
Noninterest income	243	226
Asset Management Group | Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Noninterest income	243	226
Asset Management Group | Out-of-Scope
Disaggregation of Revenue [Line Items]
Noninterest income	5	3
Asset Management Group | Asset management fees | Asset management & brokerage
Disaggregation of Revenue [Line Items]
Noninterest income	241	226
Asset Management Group | Brokerage fees | Asset management & brokerage
Disaggregation of Revenue [Line Items]
Noninterest income	2
Other
Disaggregation of Revenue [Line Items]
Noninterest income	$ 91	$ 182