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Credit Quality And Allowance For Credit Losses (Aging Analysis Of Loans) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	$ 159	$ 401
Nonaccrual Loans	186	240
Current Loans	55,419	52,761
Total loans	55,764	53,402
30-59 Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	114	341
60-89  Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	36	37
90 Days or More
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	9	23
Business loans: | Commercial borrower
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	137	366
Nonaccrual Loans	136	171
Current Loans	51,344	48,740
Total loans	51,617	49,277
Business loans: | Commercial borrower | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	97	310
Business loans: | Commercial borrower | 60-89  Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	32	33
Business loans: | Commercial borrower | 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	8	23
Business loans: | Commercial borrower | Domestic
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	70	271
Nonaccrual Loans	93	142
Current Loans	31,582	30,496
Total loans	31,745	30,909
Business loans: | Commercial borrower | Domestic | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	52	238
Business loans: | Commercial borrower | Domestic | 60-89  Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	11	13
Business loans: | Commercial borrower | Domestic | 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	7	20
Business loans: | Commercial borrower | International
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	3	9
Nonaccrual Loans	4	3
Current Loans	1,275	1,185
Total loans	1,282	1,197
Business loans: | Commercial borrower | International | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	3	0
Business loans: | Commercial borrower | International | 60-89  Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	0	9
Business loans: | Commercial borrower | International | 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	0	0
Business loans: | Commercial borrower | Real estate construction: | Domestic
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	26	2
Nonaccrual Loans	2	3
Current Loans	3,955	3,100
Total loans	3,983	3,105
Business loans: | Commercial borrower | Real estate construction: | Domestic | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	13	2
Business loans: | Commercial borrower | Real estate construction: | Domestic | 60-89  Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	13	0
Business loans: | Commercial borrower | Real estate construction: | Domestic | 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	0	0
Business loans: | Commercial borrower | Real estate construction: | Domestic | Commercial
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	0	0
Nonaccrual Loans	0	0
Current Loans	3,422	2,505
Total loans	3,422	2,505
Business loans: | Commercial borrower | Real estate construction: | Domestic | Commercial | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	0	0
Business loans: | Commercial borrower | Real estate construction: | Domestic | Commercial | 60-89  Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	0	0
Business loans: | Commercial borrower | Real estate construction: | Domestic | Commercial | 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	0	0
Business loans: | Commercial borrower | Real estate construction: | Domestic | Other business lines
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	26	2
Nonaccrual Loans	2	3
Current Loans	533	595
Total loans	561	600
Business loans: | Commercial borrower | Real estate construction: | Domestic | Other business lines | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	13	2
Business loans: | Commercial borrower | Real estate construction: | Domestic | Other business lines | 60-89  Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	13	0
Business loans: | Commercial borrower | Real estate construction: | Domestic | Other business lines | 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	0	0
Business loans: | Commercial borrower | Commercial mortgage: | Domestic
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	33	78
Nonaccrual Loans	37	23
Current Loans	13,781	13,205
Total loans	13,851	13,306
Business loans: | Commercial borrower | Commercial mortgage: | Domestic | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	24	64
Business loans: | Commercial borrower | Commercial mortgage: | Domestic | 60-89  Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	8	11
Business loans: | Commercial borrower | Commercial mortgage: | Domestic | 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	1	3
Business loans: | Commercial borrower | Commercial mortgage: | Domestic | Commercial
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	0	6
Nonaccrual Loans	1	1
Current Loans	4,982	4,674
Total loans	4,983	4,681
Business loans: | Commercial borrower | Commercial mortgage: | Domestic | Commercial | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	0	0
Business loans: | Commercial borrower | Commercial mortgage: | Domestic | Commercial | 60-89  Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	0	6
Business loans: | Commercial borrower | Commercial mortgage: | Domestic | Commercial | 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	0	0
Business loans: | Commercial borrower | Commercial mortgage: | Domestic | Other business lines
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	33	72
Nonaccrual Loans	36	22
Current Loans	8,799	8,531
Total loans	8,868	8,625
Business loans: | Commercial borrower | Commercial mortgage: | Domestic | Other business lines | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	24	64
Business loans: | Commercial borrower | Commercial mortgage: | Domestic | Other business lines | 60-89  Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	8	5
Business loans: | Commercial borrower | Commercial mortgage: | Domestic | Other business lines | 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	1	3
Business loans: | Commercial borrower | Lease financing | Domestic
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	5	6
Nonaccrual Loans	0	0
Current Loans	751	754
Total loans	756	760
Business loans: | Commercial borrower | Lease financing | Domestic | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	5	6
Business loans: | Commercial borrower | Lease financing | Domestic | 60-89  Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	0	0
Business loans: | Commercial borrower | Lease financing | Domestic | 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	0	0
Retail loans:
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	22	35
Nonaccrual Loans	50	69
Current Loans	4,075	4,021
Total loans	4,147	4,125
Retail loans: | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	17	31
Retail loans: | 60-89  Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	4	4
Retail loans: | 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	1	0
Retail loans: | Residential mortgage
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	8	22
Nonaccrual Loans	33	53
Current Loans	1,853	1,739
Total loans	1,894	1,814
Retail loans: | Residential mortgage | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	8	22
Retail loans: | Residential mortgage | 60-89  Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	0	0
Retail loans: | Residential mortgage | 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	0	0
Retail loans: | Consumer
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	14	13
Nonaccrual Loans	17	16
Current Loans	2,222	2,282
Total loans	2,253	2,311
Retail loans: | Consumer | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	9	9
Retail loans: | Consumer | 60-89  Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	4	4
Retail loans: | Consumer | 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	1	0
Retail loans: | Consumer | Home equity
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	8	7
Nonaccrual Loans	17	15
Current Loans	1,747	1,754
Total loans	1,772	1,776
Retail loans: | Consumer | Home equity | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	6	4
Retail loans: | Consumer | Home equity | 60-89  Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	2	3
Retail loans: | Consumer | Home equity | 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	0	0
Retail loans: | Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	6	6
Nonaccrual Loans	0	1
Current Loans	475	528
Total loans	481	535
Retail loans: | Consumer | Other consumer | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	3	5
Retail loans: | Consumer | Other consumer | 60-89  Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	2	1
Retail loans: | Consumer | Other consumer | 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	$ 1	$ 0

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