Loans, Leases, and Allowance for Credit Losses (Summary of Outstanding Loan Balances (Accruing And Nonaccruing) Categorized By Credit Quality Indicators) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	$ 13,059	$ 12,539
2021/2020	10,344	8,182
2020/2019	6,360	5,938
2019/2018	4,239	3,865
2018/2017	2,347	2,776
Prior	5,667	5,654
Revolving loans amortized cost basis	13,064	11,327
Revolving loans converted to term loans amortized cost basis	573	570
Total loans	55,653	50,851
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	6,987	7,717
2021/2020	5,522	4,350
2020/2019	3,072	3,022
2019/2018	2,430	2,087
2018/2017	1,228	1,503
Prior	2,568	2,414
Revolving loans amortized cost basis	8,426	7,132
Revolving loans converted to term loans amortized cost basis	262	215
Total loans	30,495	28,440
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	3,508	3,078
2021/2020	2,802	2,553
2020/2019	2,186	2,094
2019/2018	1,140	1,255
2018/2017	726	575
Prior	1,276	1,505
Revolving loans amortized cost basis	893	889
Revolving loans converted to term loans amortized cost basis	208	249
Total loans	12,739	12,198
Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	2,564	1,744
2021/2020	2,020	1,279
2020/2019	1,102	822
2019/2018	669	523
2018/2017	393	698
Prior	1,823	1,735
Revolving loans amortized cost basis	3,745	3,306
Revolving loans converted to term loans amortized cost basis	103	106
Total loans	12,419	10,213
Commercial and industrial \| Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	3,390	2,607
2021/2020	1,814	1,358
2020/2019	891	1,293
2019/2018	1,017	816
2018/2017	325	387
Prior	335	328
Revolving loans amortized cost basis	8,220	6,935
Revolving loans converted to term loans amortized cost basis	188	143
Total loans	16,180	13,867
PPP \| Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	0	1,317
2021/2020	77	538
2020/2019	120	0
2019/2018	0	0
2018/2017	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans amortized cost basis	0	0
Total loans	197	1,855
Leasing \| Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	160	46
2021/2020	71	75
2020/2019	47	74
2019/2018	66	65
2018/2017	18	43
Prior	24	24
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans amortized cost basis	0	0
Total loans	386	327
Owner-occupied \| Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	2,175	2,444
2021/2020	2,334	1,407
2020/2019	1,198	1,102
2019/2018	906	956
2018/2017	717	746
Prior	1,769	1,812
Revolving loans amortized cost basis	198	194
Revolving loans converted to term loans amortized cost basis	74	72
Total loans	9,371	8,733
Municipal \| Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	1,262	1,303
2021/2020	1,226	972
2020/2019	816	553
2019/2018	441	250
2018/2017	168	327
Prior	440	250
Revolving loans amortized cost basis	8	3
Revolving loans converted to term loans amortized cost basis	0	0
Total loans	4,361	3,658
Construction and land development \| Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	566	640
2021/2020	672	739
2020/2019	455	544
2019/2018	103	94
2018/2017	2	24
Prior	2	2
Revolving loans amortized cost basis	617	650
Revolving loans converted to term loans amortized cost basis	96	64
Total loans	2,513	2,757
Term \| Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	2,942	2,438
2021/2020	2,130	1,814
2020/2019	1,731	1,550
2019/2018	1,037	1,161
2018/2017	724	551
Prior	1,274	1,503
Revolving loans amortized cost basis	276	239
Revolving loans converted to term loans amortized cost basis	112	185
Total loans	10,226	9,441
Home equity credit line \| Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
Prior	0	0
Revolving loans amortized cost basis	3,276	2,913
Revolving loans converted to term loans amortized cost basis	101	103
Total loans	3,377	3,016
1-4 family residential \| Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	1,913	1,391
2021/2020	1,505	1,024
2020/2019	1,026	732
2019/2018	642	487
2018/2017	384	690
Prior	1,816	1,726
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans amortized cost basis	0	0
Total loans	7,286	6,050
Construction and other consumer real estate \| Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	583	295
2021/2020	485	232
2020/2019	64	73
2019/2018	19	27
2018/2017	5	4
Prior	5	7
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans amortized cost basis	0	0
Total loans	1,161	638
Bankcard and other revolving plans \| Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
Prior	0	0
Revolving loans amortized cost basis	469	393
Revolving loans converted to term loans amortized cost basis	2	3
Total loans	471	396
Other \| Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	68	58
2021/2020	30	23
2020/2019	12	17
2019/2018	8	9
2018/2017	4	4
Prior	2	2
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans amortized cost basis	0	0
Total loans	124	113
Pass \| Commercial and industrial \| Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	3,363	2,561
2021/2020	1,799	1,309
2020/2019	864	1,179
2019/2018	876	748
2018/2017	293	354
Prior	264	239
Revolving loans amortized cost basis	8,054	6,594
Revolving loans converted to term loans amortized cost basis	182	121
Total loans	15,695	13,105
Pass \| PPP \| Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	0	1,317
2021/2020	75	535
2020/2019	115	0
2019/2018	0	0
2018/2017	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans amortized cost basis	0	0
Total loans	190	1,852
Pass \| Leasing \| Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	160	46
2021/2020	71	74
2020/2019	47	70
2019/2018	66	64
2018/2017	18	42
Prior	19	19
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans amortized cost basis	0	0
Total loans	381	315
Pass \| Owner-occupied \| Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	2,157	2,420
2021/2020	2,285	1,366
2020/2019	1,143	1,028
2019/2018	874	868
2018/2017	654	695
Prior	1,679	1,663
Revolving loans amortized cost basis	187	177
Revolving loans converted to term loans amortized cost basis	74	69
Total loans	9,053	8,286
Pass \| Municipal \| Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	1,230	1,303
2021/2020	1,220	963
2020/2019	816	553
2019/2018	441	250
2018/2017	168	327
Prior	437	220
Revolving loans amortized cost basis	8	3
Revolving loans converted to term loans amortized cost basis	0	0
Total loans	4,320	3,619
Pass \| Construction and land development \| Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	548	640
2021/2020	671	736
2020/2019	455	515
2019/2018	81	94
2018/2017	2	24
Prior	2	2
Revolving loans amortized cost basis	617	650
Revolving loans converted to term loans amortized cost basis	96	64
Total loans	2,472	2,725
Pass \| Term \| Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	2,861	2,407
2021/2020	2,107	1,765
2020/2019	1,686	1,491
2019/2018	1,012	1,066
2018/2017	666	529
Prior	1,229	1,401
Revolving loans amortized cost basis	276	239
Revolving loans converted to term loans amortized cost basis	112	179
Total loans	9,949	9,077
Pass \| Home equity credit line \| Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
Prior	0	0
Revolving loans amortized cost basis	3,265	2,903
Revolving loans converted to term loans amortized cost basis	98	96
Total loans	3,363	2,999
Pass \| 1-4 family residential \| Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	1,913	1,391
2021/2020	1,503	1,021
2020/2019	1,024	728
2019/2018	638	484
2018/2017	381	681
Prior	1,788	1,691
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans amortized cost basis	0	0
Total loans	7,247	5,996
Pass \| Construction and other consumer real estate \| Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	583	295
2021/2020	485	232
2020/2019	64	73
2019/2018	19	27
2018/2017	5	4
Prior	5	7
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans amortized cost basis	0	0
Total loans	1,161	638
Pass \| Bankcard and other revolving plans \| Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
Prior	0	0
Revolving loans amortized cost basis	468	391
Revolving loans converted to term loans amortized cost basis	2	3
Total loans	470	394
Pass \| Other \| Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	68	58
2021/2020	30	23
2020/2019	12	17
2019/2018	8	9
2018/2017	4	4
Prior	2	2
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans amortized cost basis	0	0
Total loans	124	113
Special Mention \| Commercial and industrial \| Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	1	4
2021/2020	2	17
2020/2019	10	9
2019/2018	52	12
2018/2017	1	1
Prior	2	3
Revolving loans amortized cost basis	50	128
Revolving loans converted to term loans amortized cost basis	0	1
Total loans	118	175
Special Mention \| Leasing \| Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	0	0
2021/2020	0	1
2020/2019	0	4
2019/2018	0	1
2018/2017	0	1
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans amortized cost basis	0	0
Total loans	0	7
Special Mention \| Owner-occupied \| Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	1	10
2021/2020	15	13
2020/2019	5	19
2019/2018	8	32
2018/2017	3	18
Prior	16	50
Revolving loans amortized cost basis	1	3
Revolving loans converted to term loans amortized cost basis	0	3
Total loans	49	148
Special Mention \| Municipal \| Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	32	0
2021/2020	6	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
Prior	0	25
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans amortized cost basis	0	0
Total loans	38	25
Special Mention \| Construction and land development \| Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	1	0
2021/2020	1	0
2020/2019	0	1
2019/2018	0	0
2018/2017	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans amortized cost basis	0	0
Total loans	2	1
Special Mention \| Term \| Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	39	22
2021/2020	21	39
2020/2019	11	10
2019/2018	0	17
2018/2017	4	8
Prior	1	25
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans amortized cost basis	0	4
Total loans	76	125
Special Mention \| Home equity credit line \| Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
Prior	0	0
Revolving loans amortized cost basis	0	1
Revolving loans converted to term loans amortized cost basis	0	0
Total loans	0	1
Special Mention \| 1-4 family residential \| Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans amortized cost basis	0	0
Total loans	0	0
Special Mention \| Construction and other consumer real estate \| Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans amortized cost basis	0	0
Total loans	0	0
Special Mention \| Bankcard and other revolving plans \| Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans amortized cost basis	0	0
Total loans	0	0
Special Mention \| Other \| Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans amortized cost basis	0	0
Total loans	0	0
Accruing Substandard \| Commercial and industrial \| Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	26	28
2021/2020	7	22
2020/2019	17	99
2019/2018	78	53
2018/2017	30	31
Prior	67	65
Revolving loans amortized cost basis	84	162
Revolving loans converted to term loans amortized cost basis	2	3
Total loans	311	463
Accruing Substandard \| Leasing \| Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
Prior	5	5
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans amortized cost basis	0	0
Total loans	5	5
Accruing Substandard \| Owner-occupied \| Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	16	14
2021/2020	33	24
2020/2019	48	41
2019/2018	20	47
2018/2017	55	24
Prior	64	79
Revolving loans amortized cost basis	9	13
Revolving loans converted to term loans amortized cost basis	0	0
Total loans	245	242
Accruing Substandard \| Municipal \| Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	0	0
2021/2020	0	9
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
Prior	3	5
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans amortized cost basis	0	0
Total loans	3	14
Accruing Substandard \| Construction and land development \| Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	17	0
2021/2020	0	3
2020/2019	0	28
2019/2018	22	0
2018/2017	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans amortized cost basis	0	0
Total loans	39	31
Accruing Substandard \| Term \| Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	42	9
2021/2020	2	9
2020/2019	34	44
2019/2018	21	77
2018/2017	53	14
Prior	35	64
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans amortized cost basis	0	2
Total loans	187	219
Accruing Substandard \| Home equity credit line \| Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0

Loans, Leases, and Allowance for Credit Losses (Summary of Outstanding Loan Balances (Accruing And Nonaccruing) Categorized By Credit Quality Indicators) (Details) - USD ($)
$ in Millions