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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Total noninterest income	$ 2,109	$ 1,783	$ 3,990	$ 3,801
Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	1,479	1,393	2,917	2,779
Out-of-scope noninterest income	1,107	358	1,551	831
Other
Disaggregation of Revenue [Line Items]
Total noninterest income	(477)	32	(478)	191
Retail Banking | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	620	613	1,209	1,212
Out-of-scope noninterest income	789	89	964	233
Total noninterest income	1,409	702	2,173	1,445
Retail Banking | Asset management and brokerage | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	135	124	272	254
Retail Banking | Brokerage fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	135	124	272	254
Retail Banking | Card and cash management | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	308	320	589	616
Retail Banking | Treasury management fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	11	11	21	21
Retail Banking | Debit card fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	176	178	343	343
Retail Banking | Net credit card fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	58	61	103	119
Retail Banking | Interchange Fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	170	173	328	333
Retail Banking | Credit Card Reward Costs | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	113	112	226	214
Retail Banking | Merchant services | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	41	45	78	84
Retail Banking | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	22	25	44	49
Retail Banking | Lending and deposit services | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	177	169	348	342
Retail Banking | Deposit account fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	158	151	313	306
Retail Banking | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	19	18	35	36
Corporate & Institutional Banking | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	630	556	1,252	1,117
Out-of-scope noninterest income	312	265	578	590
Total noninterest income	942	821	1,830	1,707
Corporate & Institutional Banking | Card and cash management | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	390	364	766	711
Corporate & Institutional Banking | Treasury management fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	371	345	728	673
Corporate & Institutional Banking | Merchant services | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	19	19	38	38
Corporate & Institutional Banking | Lending and deposit services | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	8	8	17	16
Corporate & Institutional Banking | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	8	8	17	16
Corporate & Institutional Banking | Residential and commercial mortgage | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	28	40	58	82
Corporate & Institutional Banking | Capital markets and advisory | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	193	130	383	286
Corporate & Institutional Banking | Other | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	11	14	28	22
Asset Management Group | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	229	224	456	450
Out-of-scope noninterest income	6	4	9	8
Total noninterest income	235	228	465	458
Asset Management Group | Asset management and brokerage | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	229	224	456	450
Asset Management Group | Asset management fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income	229	222	456	446
Asset Management Group | Brokerage fees | Operating Segments
Disaggregation of Revenue [Line Items]
Total in-scope noninterest income		$ 2		$ 4