Loans and Leases - Schedule of Loans Disaggregated by Year of Origination and by Risk Rating (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 65,524	$ 32,372	$ 33,181
Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	64,995	32,235
30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	287	71
60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	61	16
90 days or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	181	50
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	5,254	6,506
2021	11,922	5,323
2020	9,658	3,380
2019	7,958	1,843
2018	4,182	1,495
2017 & Prior	6,369	2,414
Revolving	4,707	1,619
Revolving Converted to Term Loans	51	6
Total loans and leases	50,101	22,586
Commercial | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	49,736	22,529
Commercial | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	210	33
Commercial | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	44	5
Commercial | 90 days or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	111	19
Commercial | Commercial construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	303	542
2021	776	400
2020	820	190
2019	497	31
2018	132	52
2017 & Prior	90	13
Revolving	15	10
Revolving Converted to Term Loans	0	0
Total loans and leases	2,633	1,238
Commercial | Commercial construction | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,576	1,235
Commercial | Commercial construction | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	55	1
Commercial | Commercial construction | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	0
Commercial | Commercial construction | 90 days or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2	2
Commercial | Commercial construction | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	300	540
2021	775	400
2020	790	189
2019	439	29
2018	102	48
2017 & Prior	85	11
Revolving	15	10
Revolving Converted to Term Loans	0	0
Total loans and leases	2,506	1,227
Commercial | Commercial construction | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	2	0
2021	0	0
2020	30	0
2019	25	0
2018	28	0
2017 & Prior	0	1
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	85	1
Commercial | Commercial construction | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	1	2
2021	1	0
2020	0	1
2019	30	2
2018	2	4
2017 & Prior	5	1
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	39	10
Commercial | Commercial construction | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	3	0
2018	0	0
2017 & Prior	0	0
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	3	0
Commercial | Commercial construction | Ungraded
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017 & Prior	0	0
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	0	0
Commercial | Owner occupied commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	647	3,079
2021	3,340	3,073
2020	3,257	1,928
2019	2,154	1,228
2018	1,306	994
2017 & Prior	2,698	1,661
Revolving	151	136
Revolving Converted to Term Loans	0	0
Total loans and leases	13,553	12,099
Commercial | Owner occupied commercial mortgage | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	13,502	12,068
Commercial | Owner occupied commercial mortgage | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	22	21
Commercial | Owner occupied commercial mortgage | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	16	1
Commercial | Owner occupied commercial mortgage | 90 days or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	13	9
Commercial | Owner occupied commercial mortgage | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	642	3,045
2021	3,311	3,022
2020	3,176	1,873
2019	2,080	1,194
2018	1,213	963
2017 & Prior	2,499	1,572
Revolving	143	125
Revolving Converted to Term Loans	0	0
Total loans and leases	13,064	11,794
Commercial | Owner occupied commercial mortgage | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	3	3
2021	3	35
2020	44	37
2019	37	22
2018	19	13
2017 & Prior	74	33
Revolving	4	5
Revolving Converted to Term Loans	0	0
Total loans and leases	184	148
Commercial | Owner occupied commercial mortgage | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	2	31
2021	26	16
2020	37	18
2019	37	12
2018	74	18
2017 & Prior	124	56
Revolving	4	6
Revolving Converted to Term Loans	0	0
Total loans and leases	304	157
Commercial | Owner occupied commercial mortgage | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017 & Prior	1	0
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	1	0
Commercial | Owner occupied commercial mortgage | Ungraded
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017 & Prior	0	0
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	0	0
Commercial | Non-owner occupied commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	534	654
2021	1,748	748
2020	1,870	602
2019	2,377	278
2018	999	277
2017 & Prior	1,725	444
Revolving	40	38
Revolving Converted to Term Loans	0	0
Total loans and leases	9,293	3,041
Commercial | Non-owner occupied commercial mortgage | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	9,213	3,036
Commercial | Non-owner occupied commercial mortgage | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	20	3
Commercial | Non-owner occupied commercial mortgage | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	0
Commercial | Non-owner occupied commercial mortgage | 90 days or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	60	2
Commercial | Non-owner occupied commercial mortgage | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	532	644
2021	1,731	737
2020	1,844	578
2019	1,953	263
2018	936	266
2017 & Prior	1,510	412
Revolving	39	37
Revolving Converted to Term Loans	0	0
Total loans and leases	8,545	2,937
Commercial | Non-owner occupied commercial mortgage | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	0	1
2021	1	0
2020	0	0
2019	95	3
2018	3	3
2017 & Prior	37	10
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	136	17
Commercial | Non-owner occupied commercial mortgage | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	2	9
2021	16	11
2020	26	24
2019	324	12
2018	60	7
2017 & Prior	166	22
Revolving	1	1
Revolving Converted to Term Loans	0	0
Total loans and leases	595	86
Commercial | Non-owner occupied commercial mortgage | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	5	0
2018	0	1
2017 & Prior	12	0
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	17	1
Commercial | Non-owner occupied commercial mortgage | Ungraded
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017 & Prior	0	0
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	0	0
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	3,583	2,136
2021	5,377	1,032
2020	3,092	622
2019	2,540	263
2018	1,556	155
2017 & Prior	1,702	288
Revolving	4,501	1,435
Revolving Converted to Term Loans	51	6
Total loans and leases	22,402	5,937
Commercial | Commercial and industrial | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	22,291	5,921
Commercial | Commercial and industrial | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	73	8
Commercial | Commercial and industrial | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	15	3
Commercial | Commercial and industrial | 90 days or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	23	5
Commercial | Commercial and industrial | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	3,525	2,107
2021	5,292	1,018
2020	2,865	599
2019	2,244	257
2018	1,277	149
2017 & Prior	1,389	281
Revolving	4,100	1,342
Revolving Converted to Term Loans	50	5
Total loans and leases	20,742	5,758
Commercial | Commercial and industrial | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	32	9
2021	19	7
2020	117	20
2019	113	2
2018	103	4
2017 & Prior	38	5
Revolving	52	5
Revolving Converted to Term Loans	0	0
Total loans and leases	474	52
Commercial | Commercial and industrial | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	26	20
2021	63	7
2020	109	3
2019	181	4
2018	162	2
2017 & Prior	239	2
Revolving	247	16
Revolving Converted to Term Loans	1	1
Total loans and leases	1,028	55
Commercial | Commercial and industrial | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	0	0
2021	3	0
2020	1	0
2019	2	0
2018	14	0
2017 & Prior	36	0
Revolving	18	0
Revolving Converted to Term Loans	0	0
Total loans and leases	74	0
Commercial | Commercial and industrial | Ungraded
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017 & Prior	0	0
Revolving	84	72
Revolving Converted to Term Loans	0	0
Total loans and leases	84	72
Commercial | Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	187	95
2021	681	70
2020	619	38
2019	390	43
2018	189	17
2017 & Prior	154	8
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	2,220	271
Commercial | Leases | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,154	269
Commercial | Leases | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	40	0
Commercial | Leases | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	13	1
Commercial | Leases | 90 days or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	13	1
Commercial | Leases | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	182	93
2021	635	68
2020	581	38
2019	355	42
2018	168	17
2017 & Prior	146	8
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	2,067	266
Commercial | Leases | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	2	0
2021	15	1
2020	15	0
2019	13	0
2018	8	0
2017 & Prior	3	0
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	56	1
Commercial | Leases | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	3	2
2021	28	1
2020	22	0
2019	21	1
2018	12	0
2017 & Prior	4	0
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	90	4
Commercial | Leases | Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	0	0
2021	3	0
2020	1	0
2019	1	0
2018	1	0
2017 & Prior	1	0
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	7	0
Commercial | Leases | Ungraded
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017 & Prior	0	0
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	0	0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	966	2,872
2021	4,490	2,036
2020	2,659	840
2019	1,133	497
2018	647	402
2017 & Prior	3,331	953
Revolving	2,043	2,052
Revolving Converted to Term Loans	154	134
Total loans and leases	15,423	9,786
Consumer | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	15,259	9,706
Consumer | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	77	38
Consumer | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	17	11
Consumer | 90 days or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	70	31
Consumer | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	785	2,142
2021	3,832	1,667
2020	2,331	630
2019	951	373
2018	542	352
2017 & Prior	3,250	902
Revolving	20	22
Revolving Converted to Term Loans	0	0
Total loans and leases	11,711	6,088
Consumer | Residential mortgage | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	783	2,139
2021	3,819	1,663
2020	2,325	627
2019	943	368
2018	531	349
2017 & Prior	3,156	867
Revolving	20	22
Revolving Converted to Term Loans	0	0
Total loans and leases	11,577	6,035
Consumer | Residential mortgage | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	2	2
2021	11	3
2020	4	2
2019	4	2
2018	5	1
2017 & Prior	37	14
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	63	24
Consumer | Residential mortgage | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	0	0
2021	1	0
2020	1	0
2019	0	1
2018	2	1
2017 & Prior	8	4
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	12	6
Consumer | Residential mortgage | 90 days or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	0	1
2021	1	1
2020	1	1
2019	4	2
2018	4	1
2017 & Prior	49	17
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	59	23
Consumer | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017 & Prior	0	0
Revolving	1,686	1,684
Revolving Converted to Term Loans	154	134
Total loans and leases	1,840	1,818
Consumer | Revolving mortgage | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017 & Prior	0	0
Revolving	1,680	1,678
Revolving Converted to Term Loans	143	126
Total loans and leases	1,823	1,804
Consumer | Revolving mortgage | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017 & Prior	0	0
Revolving	3	4
Revolving Converted to Term Loans	3	2
Total loans and leases	6	6
Consumer | Revolving mortgage | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017 & Prior	0	0
Revolving	1	0
Revolving Converted to Term Loans	1	2
Total loans and leases	2	2
Consumer | Revolving mortgage | 90 days or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017 & Prior	0	0
Revolving	2	2
Revolving Converted to Term Loans	7	4
Total loans and leases	9	6
Consumer | Consumer auto
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	145	598
2021	542	345
2020	308	199
2019	172	120
2018	101	48
2017 & Prior	52	22
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	1,320	1,332
Consumer | Consumer auto | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	145	597
2021	540	343
2020	305	198
2019	171	119
2018	100	48
2017 & Prior	51	19
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	1,312	1,324
Consumer | Consumer auto | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	0	1
2021	2	2
2020	1	1
2019	1	1
2018	1	0
2017 & Prior	1	1
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	6	6
Consumer | Consumer auto | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	0	0
2021	0	0
2020	1	0
2019	0	0
2018	0	0
2017 & Prior	0	1
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	1	1
Consumer | Consumer auto | 90 days or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	0	0
2021	0	0
2020	1	0
2019	0	0
2018	0	0
2017 & Prior	0	1
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	1	1
Consumer | Consumer other
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	36	132
2021	116	24
2020	20	11
2019	10	4
2018	4	2
2017 & Prior	29	29
Revolving	337	346
Revolving Converted to Term Loans	0	0
Total loans and leases	552	548
Consumer | Consumer other | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	36	131
2021	116	24
2020	20	11
2019	10	4
2018	4	2
2017 & Prior	29	29
Revolving	332	342
Revolving Converted to Term Loans	0	0
Total loans and leases	547	543
Consumer | Consumer other | 30-59 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017 & Prior	0	0
Revolving	2	2
Revolving Converted to Term Loans	0	0
Total loans and leases	2	2
Consumer | Consumer other | 60-89 days past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	0	1
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017 & Prior	0	0
Revolving	2	1
Revolving Converted to Term Loans	0	0
Total loans and leases	2	2
Consumer | Consumer other | 90 days or greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
2017 & Prior	0	0
Revolving	1	1
Revolving Converted to Term Loans	0	0
Total loans and leases	$ 1	$ 1