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Credit Quality And Allowance For Credit Losses (Aging Analysis Of Loans) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	$ 271	$ 401
Nonaccrual Loans	154	240
Current Loans	52,973	52,761
Total loans	53,398	53,402
30-59 Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	184	341
60-89  Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	42	37
90 Days or More
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	45	23
Business loans: | Commercial borrower
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	245	366
Nonaccrual Loans	118	171
Current Loans	48,894	48,740
Total loans	49,257	49,277
Business loans: | Commercial borrower | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	162	310
Business loans: | Commercial borrower | 60-89  Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	38	33
Business loans: | Commercial borrower | 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	45	23
Business loans: | Commercial borrower | Domestic
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	95	271
Nonaccrual Loans	83	142
Current Loans	28,829	30,496
Total loans	29,007	30,909
Business loans: | Commercial borrower | Domestic | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	51	238
Business loans: | Commercial borrower | Domestic | 60-89  Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	18	13
Business loans: | Commercial borrower | Domestic | 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	26	20
Business loans: | Commercial borrower | International
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	3	9
Nonaccrual Loans	3	3
Current Loans	1,188	1,185
Total loans	1,194	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	58	2
Nonaccrual Loans	2	3
Current Loans	4,485	3,100
Total loans	4,545	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	58	2
Business loans: | Commercial borrower | Real estate construction: | Domestic | 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 | 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	32	0
Nonaccrual Loans	0	0
Current Loans	3,983	2,505
Total loans	4,015	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	32	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	502	595
Total loans	530	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	26	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	0	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	81	78
Nonaccrual Loans	30	23
Current Loans	13,610	13,205
Total loans	13,721	13,306
Business loans: | Commercial borrower | Commercial mortgage: | Domestic | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	43	64
Business loans: | Commercial borrower | Commercial mortgage: | Domestic | 60-89  Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	20	11
Business loans: | Commercial borrower | Commercial mortgage: | Domestic | 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	18	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	0	1
Current Loans	4,832	4,674
Total loans	4,832	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	81	72
Nonaccrual Loans	30	22
Current Loans	8,778	8,531
Total loans	8,889	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	43	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	20	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	18	3
Business loans: | Commercial borrower | Lease financing | Domestic
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	8	6
Nonaccrual Loans	0	0
Current Loans	782	754
Total loans	790	760
Business loans: | Commercial borrower | Lease financing | Domestic | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	7	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	1	0
Retail loans:
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	26	35
Nonaccrual Loans	36	69
Current Loans	4,079	4,021
Total loans	4,141	4,125
Retail loans: | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	22	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	0	0
Retail loans: | Residential mortgage
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	9	22
Nonaccrual Loans	19	53
Current Loans	1,877	1,739
Total loans	1,905	1,814
Retail loans: | Residential mortgage | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	7	22
Retail loans: | Residential mortgage | 60-89  Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	2	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	17	13
Nonaccrual Loans	17	16
Current Loans	2,202	2,282
Total loans	2,236	2,311
Retail loans: | Consumer | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	15	9
Retail loans: | Consumer | 60-89  Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	2	4
Retail loans: | Consumer | 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	0	0
Retail loans: | Consumer | Home equity
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	15	7
Nonaccrual Loans	17	15
Current Loans	1,732	1,754
Total loans	1,764	1,776
Retail loans: | Consumer | Home equity | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	13	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	2	6
Nonaccrual Loans	0	1
Current Loans	470	528
Total loans	472	535
Retail loans: | Consumer | Other consumer | 30-59 Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	2	5
Retail loans: | Consumer | Other consumer | 60-89  Days
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	0	1
Retail loans: | Consumer | Other consumer | 90 Days or More
Financing Receivable, Past Due [Line Items]
Loans Past Due and Still Accruing	$ 0	$ 0

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