Credit Quality And Allowance For Credit Losses (Aging Analysis Of Loans) (Details) - USD ($) $ in Millions		Dec. 31, 2023		Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Total Nonaccrual Loans		$ 178		$ 240
Total loans		52,113		53,402
Loans past due and still accruing		218		401
Current loans		51,717		52,761
30 to 59 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		161		341
60 to 89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		37		37
90 days or more past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		20		23
Real estate construction loans
Financing Receivable, Past Due [Line Items]
Total loans		5,083		3,105
Real estate construction loans | Commercial Real Estate business line
Financing Receivable, Past Due [Line Items]
Total loans		4,570		2,505
Real estate construction loans | Other Business Lines Member
Financing Receivable, Past Due [Line Items]
Total loans		513		600
Commercial mortgage
Financing Receivable, Past Due [Line Items]
Total loans		13,686		13,306
Commercial mortgage | Commercial Real Estate business line
Financing Receivable, Past Due [Line Items]
Total loans		4,727		4,681
Commercial mortgage | Other Business Lines Member
Financing Receivable, Past Due [Line Items]
Total loans		8,959		8,625
Total commercial real estate
Financing Receivable, Past Due [Line Items]
Total loans		18,769		16,411
Business loans | Commercial
Financing Receivable, Past Due [Line Items]
Total Nonaccrual Loans		138		171
Total loans		47,929		49,277
Loans past due and still accruing		155		366
Current loans		47,636		48,740
Business loans | Commercial | 30 to 59 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		109		310
Business loans | Commercial | 60 to 89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		26		33
Business loans | Commercial | 90 days or more past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		20		23
Business loans | Commercial | Domestic loans
Financing Receivable, Past Due [Line Items]
Total Nonaccrual Loans		75		142
Total loans		27,251		30,909
Loans past due and still accruing		72		271
Current loans		27,104		30,496
Business loans | Commercial | Domestic loans | 30 to 59 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		48		238
Business loans | Commercial | Domestic loans | 60 to 89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		14		13
Business loans | Commercial | Domestic loans | 90 days or more past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		10		20
Business loans | Commercial | International loans
Financing Receivable, Past Due [Line Items]
Total Nonaccrual Loans		20		3
Total loans		1,102		1,197
Loans past due and still accruing		1		9
Current loans		1,081		1,185
Business loans | Commercial | International loans | 30 to 59 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		0		0
Business loans | Commercial | International loans | 60 to 89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		0		9
Business loans | Commercial | International loans | 90 days or more past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		1		0
Business loans | Commercial | Real estate construction loans | Domestic loans
Financing Receivable, Past Due [Line Items]
Total Nonaccrual Loans		2		3
Total loans		5,083		3,105
Loans past due and still accruing		3		2
Current loans		5,078		3,100
Business loans | Commercial | Real estate construction loans | Domestic loans | 30 to 59 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		3		2
Business loans | Commercial | Real estate construction loans | 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 | Real estate construction loans | 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
Business loans | Commercial | Real estate construction loans | Domestic loans | Commercial
Financing Receivable, Past Due [Line Items]
Total Nonaccrual Loans		0	[1]	0
Total loans	[1]	4,570		2,505
Loans past due and still accruing	[1]	0		0
Current loans		4,570		2,505
Business loans | Commercial | Real estate construction loans | Domestic loans | Commercial | 30 to 59 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		0	[1]	0
Business loans | Commercial | Real estate construction loans | Domestic loans | Commercial | 60 to 89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		0	[1]	0
Business loans | Commercial | Real estate construction loans | Domestic loans | Commercial | 90 days or more past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		0	[1]	0
Business loans | Commercial | Real estate construction loans | Domestic loans | Other business lines
Financing Receivable, Past Due [Line Items]
Total Nonaccrual Loans		2		3
Total loans	[2]	513		600
Loans past due and still accruing	[2]	3		2
Current loans		508		595
Business loans | Commercial | Real estate construction loans | 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		2
Business loans | Commercial | Real estate construction loans | 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		0		0
Business loans | Commercial | Real estate construction loans | 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		0		0
Business loans | Commercial | Commercial mortgage | Domestic loans
Financing Receivable, Past Due [Line Items]
Total Nonaccrual Loans		41		23
Total loans		13,686		13,306
Loans past due and still accruing		75		78
Current loans		13,570		13,205
Business loans | Commercial | 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		54		64
Business loans | Commercial | 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		12		11
Business loans | Commercial | 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		9		3
Business loans | Commercial | Commercial mortgage | Domestic loans | Commercial
Financing Receivable, Past Due [Line Items]
Total Nonaccrual Loans	[3]	18		1
Total loans	[1]	4,727		4,681
Loans past due and still accruing	[1]	5		6
Current loans		4,704		4,674
Business loans | Commercial | Commercial mortgage | Domestic loans | Commercial | 30 to 59 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		5		0
Business loans | Commercial | Commercial mortgage | Domestic loans | Commercial | 60 to 89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		0		6
Business loans | Commercial | Commercial mortgage | Domestic loans | Commercial | 90 days or more past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		0		0
Business loans | Commercial | Commercial mortgage | Domestic loans | Other business lines
Financing Receivable, Past Due [Line Items]
Total Nonaccrual Loans		23		22
Total loans	[2]	8,959		8,625
Loans past due and still accruing	[2]	70		72
Current loans		8,866		8,531
Business loans | Commercial | 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		49		64
Business loans | Commercial | 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		12		5
Business loans | Commercial | 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		9		3
Business loans | Commercial | Lease financing | Domestic loans
Financing Receivable, Past Due [Line Items]
Total Nonaccrual Loans		0		0
Total loans		807		760
Loans past due and still accruing		4		6
Current loans		803		754
Business loans | Commercial | 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		4		6
Business loans | Commercial | 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 | 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]
Total Nonaccrual Loans		40		69
Total loans		4,184		4,125
Loans past due and still accruing		63		35
Current loans		4,081		4,021
Retail loans | 30 to 59 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		52		31
Retail loans | 60 to 89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		11		4
Retail 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 | Residential mortgage
Financing Receivable, Past Due [Line Items]
Total Nonaccrual Loans		19		53
Total loans		1,889		1,814
Loans past due and still accruing		16		22
Current loans		1,854		1,739
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		10		22
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		6		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 | Consumer
Financing Receivable, Past Due [Line Items]
Total Nonaccrual Loans		21		16
Total loans		2,295		2,311
Loans past due and still accruing		47		13
Current loans		2,227		2,282
Retail loans | Consumer | 30 to 59 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		42		9
Retail loans | Consumer | 60 to 89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		5		4
Retail loans | Consumer | 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 | Consumer | Home equity
Financing Receivable, Past Due [Line Items]
Total Nonaccrual Loans		21		15
Total loans		1,792		1,776
Loans past due and still accruing		16		7
Current loans		1,755		1,754
Retail loans | Consumer | Home equity | 30 to 59 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		11		4
Retail loans | Consumer | Home equity | 60 to 89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		5		3
Retail loans | Consumer | 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 | Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Total Nonaccrual Loans		0		1
Total loans		503		535
Loans past due and still accruing		31		6
Current loans		472		528
Retail loans | Consumer | Other consumer | 30 to 59 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		31		5
Retail loans | Consumer | Other consumer | 60 to 89 days past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		0		1
Retail loans | Consumer | Other consumer | 90 days or more past due and still accruing
Financing Receivable, Past Due [Line Items]
Loans past due and still accruing		$ 0		$ 0

[1] Primarily loans to real estate developers.

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

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