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Allowance For Credit Losses (Loans by Class Modified byTDRs) (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2022 USD ($) obligor	Sep. 30, 2022 USD ($) obligor
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	203	1,129
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 78	$ 288
Increase in Allowance at Modification	$ 2	$ 8
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	17	46
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 58	$ 121
Increase in Allowance at Modification	$ 0	$ 0
Total Investor Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	2	4
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 0	$ 35
Increase in Allowance at Modification	$ 0	$ 0
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	184	1,079
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 20	$ 132
Increase in Allowance at Modification	$ 2	$ 8
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	16	36
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 55	$ 115
Increase in Allowance at Modification	$ 0	$ 0
Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	1	10
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 0	$ 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	$ 3	$ 3
Increase in Allowance at Modification	$ 0	$ 0
Commercial investor real estate mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	2	4
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 0	$ 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	118	843
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 16	$ 116
Increase in Allowance at Modification	$ 1	$ 5
Home Equity Lines of Credit[Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	21	75
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 1	$ 5
Increase in Allowance at Modification	$ 1	$ 3
Home Equity Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Obligors | obligor	45	155
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 3	$ 11
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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