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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Total noninterest income	$ 2,022	$ 1,815	$ 6,012	$ 5,616
Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	1,570	1,398	4,487	4,177
Out-of-scope noninterest income	403	444	1,954	1,275
Other
Disaggregation of Revenue [Line Items]
Total noninterest income	49	(27)	(429)	164
Retail Banking | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	626	622	1,835	1,834
Out-of-scope noninterest income	75	162	1,039	395
Total noninterest income	701	784	2,874	2,229
Retail Banking | Asset management and brokerage | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	145	129	417	383
Retail Banking | Brokerage fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	145	129	417	383
Retail Banking | Card and cash management | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	296	305	885	921
Retail Banking | Treasury management fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	10	10	31	31
Retail Banking | Debit card fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	177	175	520	518
Retail Banking | Net credit card fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	46	54	149	173
Retail Banking | Interchange Fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	167	169	496	502
Retail Banking | Credit Card Reward Costs | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	121	115	347	329
Retail Banking | Merchant services | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	40	42	118	126
Retail Banking | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	23	24	67	73
Retail Banking | Lending and deposit services | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	185	188	533	530
Retail Banking | Deposit account fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	166	170	479	476
Retail Banking | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	19	18	54	54
Corporate & Institutional Banking | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	706	557	1,958	1,674
Out-of-scope noninterest income	324	278	902	868
Total noninterest income	1,030	835	2,860	2,542
Corporate & Institutional Banking | Card and cash management | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	390	371	1,156	1,082
Corporate & Institutional Banking | Treasury management fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	372	351	1,100	1,024
Corporate & Institutional Banking | Merchant services | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	18	20	56	58
Corporate & Institutional Banking | Lending and deposit services | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	7	8	24	24
Corporate & Institutional Banking | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	7	8	24	24
Corporate & Institutional Banking | Residential and commercial mortgage | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	32	32	90	114
Corporate & Institutional Banking | Capital markets and advisory | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	261	124	644	410
Corporate & Institutional Banking | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	16	22	44	44
Asset Management Group | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	238	219	694	669
Out-of-scope noninterest income	4	4	13	12
Total noninterest income	242	223	707	681
Asset Management Group | Asset management and brokerage | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	238	219	694	669
Asset Management Group | Asset management fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	$ 238	217	694	663
Asset Management Group | Brokerage fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income		$ 2		$ 6