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Allowance For Credit Losses (Loans by Class Modified byTDRs) (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2022 USD ($) obligor	Jun. 30, 2022 USD ($) obligor
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	487	926
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 106	$ 210
Increase in Allowance at Modification	$ 2	$ 6
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	16	29
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 24	$ 63
Increase in Allowance at Modification	$ 0	$ 0
Total Investor Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	1	2
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 27	$ 35
Increase in Allowance at Modification	$ 0	$ 0
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	470	895
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 55	$ 112
Increase in Allowance at Modification	$ 2	$ 6
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	10	20
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 23	$ 60
Increase in Allowance at Modification	$ 0	$ 0
Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	6	9
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 1	$ 3
Increase in Allowance at Modification	$ 0	$ 0
Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	0	0
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 0	$ 0
Increase in Allowance at Modification	$ 0	$ 0
Commercial investor real estate mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	1	2
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 27	$ 35
Increase in Allowance at Modification	$ 0	$ 0
Commercial Investor Real Estate Construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	0	0
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 0	$ 0
Increase in Allowance at Modification	$ 0	$ 0
Residential First Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	368	725
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 48	$ 100
Increase in Allowance at Modification	$ 1	$ 4
Home Equity Lines of Credit[Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	32	54
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 2	$ 4
Increase in Allowance at Modification	$ 1	$ 2
Home Equity Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	68	110
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 5	$ 8
Increase in Allowance at Modification	$ 0	$ 0
Consumer Credit Card Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	0	2
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 0	$ 0
Increase in Allowance at Modification	$ 0	$ 0
Other consumer- exit portfolios
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	0	0
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 0	$ 0
Increase in Allowance at Modification	$ 0	$ 0
Other Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	2	4
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 0	$ 0
Increase in Allowance at Modification	$ 0	$ 0

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Amount of other addition (reduction) in allowance reserve for credit loss.

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