Business Segments - Results of Operations and Average Assets by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information
Net interest income	$ 5,609	$ 4,770	$ 4,782
Provision for (benefit from) credit losses	563	(377)	1,097
Net Interest Income After Provision for (Benefit from) Credit Losses	5,046	5,147	3,685
Noninterest income:
Service charges on deposits	589	600	559
Wealth and asset management revenue	570	586	520
Commercial banking revenue	565	637	528
Card and processing revenue	409	402	352
Leasing business revenue	237	300	276
Mortgage banking net revenue	215	270	320
Other noninterest income	265	332	211
Securities losses, net	(82)	(7)	62
Securities losses, net -non-qualifying hedges on MSRs	(2)	(2)	2
Total noninterest income	2,766	3,118	2,830
Noninterest expense:
Compensation and benefits	2,554	2,626	2,590
Technology and communications	416	388	362
Net occupancy expense	307	312	350
Equipment expense	145	138	130
Leasing business expense	131	137	140
Marketing expense	118	107	104
Card and processing expense	80	89	121
Other noninterest expense	968	951	921
Total noninterest expense	4,719	4,748	4,718
Income (loss) before income taxes	3,093	3,517	1,797
Applicable income tax expense (benefit)	647	747	370
Net Income	2,446	2,770	1,427
Total goodwill	4,915	4,514	4,258
Total assets	207,452	211,116	204,680
Impairment losses on bank premises	9	7	30
Impairment losses and termination charges	2	3	8
Bank premises and equipment held for sale	24	24
Operating Segments | Commercial Banking
Segment Reporting Information
Net interest income	2,542	1,596	2,009
Provision for (benefit from) credit losses	33	(597)	1,086
Net Interest Income After Provision for (Benefit from) Credit Losses	2,509	2,193	923
Noninterest income:
Service charges on deposits	372	385	358
Wealth and asset management revenue	3	2	3
Commercial banking revenue	563	633	527
Card and processing revenue	87	78	68
Leasing business revenue	237	300	276
Mortgage banking net revenue	0	0	0
Other noninterest income	111	91	101
Securities losses, net	(33)	8	0
Securities losses, net -non-qualifying hedges on MSRs	0	0	0
Total noninterest income	1,340	1,497	1,333
Noninterest expense:
Compensation and benefits	639	644	606
Technology and communications	11	17	13
Net occupancy expense	40	37	32
Equipment expense	27	26	27
Leasing business expense	131	137	140
Marketing expense	5	7	9
Card and processing expense	11	7	7
Other noninterest expense	959	898	975
Total noninterest expense	1,823	1,773	1,809
Income (loss) before income taxes	2,026	1,917	447
Applicable income tax expense (benefit)	377	363	49
Net Income	1,649	1,554	398
Total goodwill	2,324	1,980	1,980
Total assets	83,535	75,387	71,801
Impairment losses of operating lease equipment	2	25	7
Operating Segments | Consumer and Small Business Banking
Segment Reporting Information
Net interest income	3,131	1,685	1,942
Provision for (benefit from) credit losses	139	120	229
Net Interest Income After Provision for (Benefit from) Credit Losses	2,992	1,565	1,713
Noninterest income:
Service charges on deposits	216	214	200
Wealth and asset management revenue	204	206	172
Commercial banking revenue	3	2	2
Card and processing revenue	308	312	269
Leasing business revenue	0	0	0
Mortgage banking net revenue	214	267	315
Other noninterest income	110	108	78
Securities losses, net	0	0	0
Securities losses, net -non-qualifying hedges on MSRs	(2)	(2)	2
Total noninterest income	1,053	1,107	1,038
Noninterest expense:
Compensation and benefits	828	833	821
Technology and communications	22	16	12
Net occupancy expense	196	197	185
Equipment expense	38	38	41
Leasing business expense	0	0	0
Marketing expense	58	41	34
Card and processing expense	72	85	116
Other noninterest expense	1,175	1,185	1,090
Total noninterest expense	2,389	2,395	2,299
Income (loss) before income taxes	1,656	277	452
Applicable income tax expense (benefit)	347	57	95
Net Income	1,309	220	357
Total goodwill	2,365	2,303	2,047
Total assets	83,697	85,455	77,169
Impairment losses on bank premises	6	6	15
Operating Segments | Wealth and Asset Management
Segment Reporting Information
Net interest income	262	88	139
Provision for (benefit from) credit losses	0	(1)	3
Net Interest Income After Provision for (Benefit from) Credit Losses	262	89	136
Noninterest income:
Service charges on deposits	1	1	1
Wealth and asset management revenue	540	558	498
Commercial banking revenue	1	2	2
Card and processing revenue	2	2	2
Leasing business revenue	0	0	0
Mortgage banking net revenue	1	3	5
Other noninterest income	0	4	18
Securities losses, net	0	0	0
Securities losses, net -non-qualifying hedges on MSRs	0	0	0
Total noninterest income	545	570	526
Noninterest expense:
Compensation and benefits	218	205	218
Technology and communications	1	1	1
Net occupancy expense	13	15	12
Equipment expense	0	0	1
Leasing business expense	0	0	0
Marketing expense	1	2	2
Card and processing expense	1	1	1
Other noninterest expense	322	316	298
Total noninterest expense	556	540	533
Income (loss) before income taxes	251	119	129
Applicable income tax expense (benefit)	53	25	27
Net Income	198	94	102
Total goodwill	226	231	231
Total assets	14,253	13,836	12,466
General Corporate and Other
Segment Reporting Information
Net interest income	(326)	1,401	692
Provision for (benefit from) credit losses	391	101	(221)
Net Interest Income After Provision for (Benefit from) Credit Losses	(717)	1,300	913
Noninterest income:
Service charges on deposits	0	0	0
Wealth and asset management revenue	0	0	0
Commercial banking revenue	(2)	0	(3)
Card and processing revenue	12	10	13
Leasing business revenue	0	0	0
Mortgage banking net revenue	0	0	0
Other noninterest income	44	129	14
Securities losses, net	(49)	(15)	62
Securities losses, net -non-qualifying hedges on MSRs	0	0	0
Total noninterest income	5	124	86
Noninterest expense:
Compensation and benefits	869	944	945
Technology and communications	382	354	336
Net occupancy expense	58	63	121
Equipment expense	80	74	61
Leasing business expense	0	0	0
Marketing expense	54	57	59
Card and processing expense	(4)	(4)	(3)
Other noninterest expense	(1,311)	(1,268)	(1,289)
Total noninterest expense	128	220	230
Income (loss) before income taxes	(840)	1,204	769
Applicable income tax expense (benefit)	(130)	302	199
Net Income	(710)	902	570
Total goodwill	0	0	0
Total assets	25,967	36,438	43,244
Impairment losses on bank premises	3	1	15
Bank premises and equipment held for sale	24	24	35
Eliminations
Segment Reporting Information
Net interest income	0	0	0
Provision for (benefit from) credit losses	0	0	0
Net Interest Income After Provision for (Benefit from) Credit Losses	0	0	0
Noninterest income:
Service charges on deposits	0	0	0
Wealth and asset management revenue	(177)	(180)	(153)
Commercial banking revenue	0	0	0
Card and processing revenue	0	0	0
Leasing business revenue	0	0	0
Mortgage banking net revenue	0	0	0
Other noninterest income	0	0	0
Securities losses, net	0	0	0
Securities losses, net -non-qualifying hedges on MSRs	0	0	0
Total noninterest income	(177)	(180)	(153)
Noninterest expense:
Compensation and benefits	0	0	0
Technology and communications	0	0	0
Net occupancy expense	0	0	0
Equipment expense	0	0	0
Leasing business expense	0	0	0
Marketing expense	0	0	0
Card and processing expense	0	0	0
Other noninterest expense	(177)	(180)	(153)
Total noninterest expense	(177)	(180)	(153)
Income (loss) before income taxes	0	0	0
Applicable income tax expense (benefit)	0	0	0
Net Income	0	0	0
Total goodwill	0	0	0
Total assets	$ 0	$ 0	$ 0