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Credit Quality And Allowance For Credit Losses (Nonaccrual Loans) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No Related Allowance	$ 92		$ 92		$ 140
Nonaccrual Loans with Related Allowance	62		62		100
Total Nonaccrual Loans	154		154		240
Interest income	2	$ 3	8	$ 7
Business loans: | Commercial
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No Related Allowance	56		56		71
Nonaccrual Loans with Related Allowance	62		62		100
Total Nonaccrual Loans	118		118		171
Business loans: | Commercial | Domestic
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No Related Allowance	38		38		64
Nonaccrual Loans with Related Allowance	45		45		78
Total Nonaccrual Loans	83		83		142
Business loans: | Commercial | International
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No Related Allowance	0		0		3
Nonaccrual Loans with Related Allowance	3		3		0
Total Nonaccrual Loans	3		3		3
Retail loans:
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No Related Allowance	36		36		69
Nonaccrual Loans with Related Allowance	0		0		0
Total Nonaccrual Loans	36		36		69
Retail loans: | Consumer
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No Related Allowance					16
Nonaccrual Loans with Related Allowance					0
Total Nonaccrual Loans	17		17		16
Real estate construction: | Business loans: | Commercial | Domestic
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual Loans	2		2		3
Real estate construction: | Commercial | Business loans: | Commercial | Domestic
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual Loans	0		0		0
Real estate construction: | Other business lines | Business loans: | Commercial | Domestic
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No Related Allowance	0		0		0
Nonaccrual Loans with Related Allowance	2		2		3
Total Nonaccrual Loans	2		2		3
Commercial mortgage: | Business loans: | Commercial | Domestic
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No Related Allowance	18		18		4
Nonaccrual Loans with Related Allowance	12		12		19
Total Nonaccrual Loans	30		30		23
Commercial mortgage: | Commercial | Business loans: | Commercial | Domestic
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No Related Allowance					0
Nonaccrual Loans with Related Allowance					1
Total Nonaccrual Loans	0		0		1
Commercial mortgage: | Other business lines | Business loans: | Commercial | Domestic
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No Related Allowance	18		18		4
Nonaccrual Loans with Related Allowance	12		12		18
Total Nonaccrual Loans	30		30		22
Residential mortgage | Retail loans:
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No Related Allowance	19		19		53
Nonaccrual Loans with Related Allowance	0		0		0
Total Nonaccrual Loans	19		19		53
Home equity | Retail loans: | Consumer
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No Related Allowance	17		17		15
Nonaccrual Loans with Related Allowance	0		0		0
Total Nonaccrual Loans	17		17		15
Other consumer | Retail loans: | Consumer
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No Related Allowance					1
Nonaccrual Loans with Related Allowance					0
Total Nonaccrual Loans	$ 0		$ 0		$ 1

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
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-Section 50
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