Credit Quality And Allowance For Credit Losses (Aging Analysis Of Loans) (Details) - USD ($) $ in Millions		Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		$ 487	$ 180
Nonaccrual loans		259	264
Current loans	[1]	50,966	48,841
Total loans		51,712	49,285
30 to 59 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		358	118
60 to 89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		57	35
90 days or more past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		72	27
Business loans | Commercial borrower
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		433	132
Nonaccrual loans		188	216
Current loans	[1]	47,076	45,069
Total loans		47,697	45,417
Business loans | Commercial borrower | 30 to 59 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		312	78
Business loans | Commercial borrower | 60 to 89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		51	31
Business loans | Commercial borrower | 90 days or more past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		70	23
Business loans | Commercial borrower | Domestic loans
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		355	59
Nonaccrual loans		154	173
Current loans	[1]	30,204	29,134
Total loans		30,713	29,366
Business loans | Commercial borrower | Domestic loans | 30 to 59 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		247	35
Business loans | Commercial borrower | Domestic loans | 60 to 89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		44	18
Business loans | Commercial borrower | Domestic loans | 90 days or more past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		64	6
Business loans | Commercial borrower | International loans
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		6	14
Nonaccrual loans		5	5
Current loans	[1]	1,205	1,189
Total loans		1,216	1,208
Business loans | Commercial borrower | International loans | 30 to 59 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		6	5
Business loans | Commercial borrower | International loans | 60 to 89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		0	8
Business loans | Commercial borrower | International loans | 90 days or more past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		0	1
Business loans | Commercial borrower | Real estate construction | Domestic loans
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		2	16
Nonaccrual loans		4	6
Current loans	[1]	2,611	2,926
Total loans		2,617	2,948
Business loans | Commercial borrower | Real estate construction | Domestic loans | 30 to 59 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		0	15
Business loans | Commercial borrower | Real estate construction | Domestic loans | 60 to 89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		0	1
Business loans | Commercial borrower | Real estate construction | Domestic loans | 90 days or more past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		2	0
Business loans | Commercial borrower | Real estate construction | Domestic loans | Commercial Real Estate business line
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing	[2]	0	0
Nonaccrual loans	[2]	0	0
Current loans	[1],[2]	2,022	2,391
Total loans	[2]	2,022	2,391
Business loans | Commercial borrower | Real estate construction | Domestic loans | Commercial Real Estate business line | 30 to 59 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing	[2]	0	0
Business loans | Commercial borrower | Real estate construction | Domestic loans | Commercial Real Estate business line | 60 to 89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing	[2]	0	0
Business loans | Commercial borrower | Real estate construction | Domestic loans | Commercial Real Estate business line | 90 days or more past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing	[2]	0	0
Business loans | Commercial borrower | Real estate construction | Domestic loans | Other business lines
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing	[3]	2	16
Nonaccrual loans	[3]	4	6
Current loans	[1],[3]	589	535
Total loans	[3]	595	557
Business loans | Commercial borrower | Real estate construction | Domestic loans | Other business lines | 30 to 59 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing	[3]	0	15
Business loans | Commercial borrower | Real estate construction | Domestic loans | Other business lines | 60 to 89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing	[3]	0	1
Business loans | Commercial borrower | Real estate construction | Domestic loans | Other business lines | 90 days or more past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing	[3]	2	0
Business loans | Commercial borrower | Commercial mortgage | Domestic loans
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		64	38
Nonaccrual loans		25	32
Current loans	[1]	12,349	11,185
Total loans		12,438	11,255
Business loans | Commercial borrower | Commercial mortgage | Domestic loans | 30 to 59 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		53	18
Business loans | Commercial borrower | Commercial mortgage | Domestic loans | 60 to 89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		7	4
Business loans | Commercial borrower | Commercial mortgage | Domestic loans | 90 days or more past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		4	16
Business loans | Commercial borrower | Commercial mortgage | Domestic loans | Commercial Real Estate business line
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing	[2]	32	0
Nonaccrual loans	[2]	1	1
Current loans	[1],[2]	4,068	3,337
Total loans	[2]	4,101	3,338
Business loans | Commercial borrower | Commercial mortgage | Domestic loans | Commercial Real Estate business line | 30 to 59 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing	[2]	32	0
Business loans | Commercial borrower | Commercial mortgage | Domestic loans | Commercial Real Estate business line | 60 to 89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing	[2]	0	0
Business loans | Commercial borrower | Commercial mortgage | Domestic loans | Commercial Real Estate business line | 90 days or more past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing	[2]	0	0
Business loans | Commercial borrower | Commercial mortgage | Domestic loans | Other business lines
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing	[3]	32	38
Nonaccrual loans	[3]	24	31
Current loans	[1],[3]	8,281	7,848
Total loans	[3]	8,337	7,917
Business loans | Commercial borrower | Commercial mortgage | Domestic loans | Other business lines | 30 to 59 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing	[3]	21	18
Business loans | Commercial borrower | Commercial mortgage | Domestic loans | Other business lines | 60 to 89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing	[3]	7	4
Business loans | Commercial borrower | Commercial mortgage | Domestic loans | Other business lines | 90 days or more past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing	[3]	4	16
Business loans | Commercial borrower | Lease financing | Domestic loans
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		6	5
Nonaccrual loans		0	0
Current loans	[1]	707	635
Total loans		713	640
Business loans | Commercial borrower | Lease financing | Domestic loans | 30 to 59 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		6	5
Business loans | Commercial borrower | Lease financing | Domestic loans | 60 to 89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		0	0
Business loans | Commercial borrower | Lease financing | Domestic loans | 90 days or more past due and still accruing
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		54	48
Nonaccrual loans		71	48
Current loans	[1]	3,890	3,772
Total loans		4,015	3,868
Retail loans | 30 to 59 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		46	40
Retail loans | 60 to 89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		6	4
Retail loans | 90 days or more past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		2	4
Retail loans | Residential mortgage
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		11	4
Nonaccrual loans		56	36
Current loans	[1]	1,686	1,731
Total loans		1,753	1,771
Retail loans | Residential mortgage | 30 to 59 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		9	4
Retail loans | Residential mortgage | 60 to 89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		2	0
Retail loans | Residential mortgage | 90 days or more past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		0	0
Retail loans | Home equity
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		43	44
Nonaccrual loans		15	12
Current loans	[1]	2,204	2,041
Total loans		2,262	2,097
Retail loans | Home equity | 30 to 59 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		37	36
Retail loans | Home equity | 60 to 89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		4	4
Retail loans | Home equity | 90 days or more past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		2	4
Retail loans | Home equity | Home equity
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		7	7
Nonaccrual loans		14	12
Current loans	[1]	1,687	1,514
Total loans		1,708	1,533
Retail loans | Home equity | Home equity | 30 to 59 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		6	4
Retail loans | Home equity | Home equity | 60 to 89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		1	3
Retail loans | Home equity | Home equity | 90 days or more past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		0	0
Retail loans | Home equity | Other consumer
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		36	37
Nonaccrual loans		1	0
Current loans	[1]	517	527
Total loans		554	564
Retail loans | Home equity | Other consumer | 30 to 59 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		31	32
Retail loans | Home equity | Other consumer | 60 to 89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		3	1
Retail loans | Home equity | Other consumer | 90 days or more past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		$ 2	$ 4

[1] Includes $22 million of loans with deferred payments not considered past due in accordance with the Coronavirus Aid, Relief, and Economic Security Act (CARES Act) at December 31, 2021.

[2] Primarily loans to real estate developers.

[3] Primarily loans secured by owner-occupied real estate.