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Credit Quality And Allowance For Credit Losses (Troubled Debt Restructurings) (Details) - Principal Deferrals - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total loans	$ 26	$ 40
Commercial | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total loans		39
Commercial | Commercial | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total loans	15	21
Commercial | Commercial | Real estate construction: | Domestic | Other business lines
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total loans	3	3
Commercial | Commercial | Commercial mortgage: | Domestic | Other business lines
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total loans	$ 8	15
Consumer: | Consumer | Home equity | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total loans		$ 1

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