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Credit Quality And Allowance For Credit Losses (Nonaccrual Loans) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No Related Allowance	$ 105		$ 105		$ 140
Nonaccrual Loans with Related Allowance	81		81		100
Total Nonaccrual Loans	186		186		240
Interest income	2	$ 2	6	$ 4
Business loans: | Commercial
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No Related Allowance	58		58		71
Nonaccrual Loans with Related Allowance	78		78		100
Total Nonaccrual Loans	136		136		171
Business loans: | Commercial | Domestic
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No Related Allowance	49		49		64
Nonaccrual Loans with Related Allowance	44		44		78
Total Nonaccrual Loans	93		93		142
Business loans: | Commercial | International
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No Related Allowance	0		0		3
Nonaccrual Loans with Related Allowance	4		4		0
Total Nonaccrual Loans	4		4		3
Retail loans:
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No Related Allowance	47		47		69
Nonaccrual Loans with Related Allowance	3		3		0
Total Nonaccrual Loans	50		50		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	9		9		4
Nonaccrual Loans with Related Allowance	28		28		19
Total Nonaccrual Loans	37		37		23
Commercial mortgage: | Commercial | Business loans: | Commercial | Domestic
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No Related Allowance	0		0		0
Nonaccrual Loans with Related Allowance	1		1		1
Total Nonaccrual Loans	1		1		1
Commercial mortgage: | Other business lines | Business loans: | Commercial | Domestic
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No Related Allowance	9		9		4
Nonaccrual Loans with Related Allowance	27		27		18
Total Nonaccrual Loans	36		36		22
Residential mortgage | Retail loans:
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans with No Related Allowance	30		30		53
Nonaccrual Loans with Related Allowance	3		3		0
Total Nonaccrual Loans	33		33		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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Amount of interest income on financing receivable on nonaccrual status.

+ References

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-Topic 326
-SubTopic 20
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-Section 50
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