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Loans and the Allowance for Credit Losses (Loans By Class Modified In TDR) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) obligor	Sep. 30, 2021 USD ($) obligor	Sep. 30, 2022 USD ($) obligor	Sep. 30, 2021 USD ($) obligor
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Obligors | obligor	203	180	1,129	642
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 78	$ 50	$ 288	$ 244
Increase in Allowance at Modification	$ 2	$ 2	$ 8	$ 7
Commercial And Industrial [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Obligors | obligor	16	18	36	59
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 55	$ 24	$ 115	$ 74
Increase in Allowance at Modification	$ 0	$ 0	$ 0	$ 0
Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Obligors | obligor	1	10	10	24
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 0	$ 4	$ 3	$ 7
Increase in Allowance at Modification	$ 0	$ 0	$ 0	$ 0
Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Obligors | obligor	0	1	0	2
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 3	$ 1	$ 3	$ 2
Increase in Allowance at Modification	$ 0	$ 0	$ 0	$ 0
Commercial investor real estate mortgage [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Obligors | obligor	2	1	4	7
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 0	$ 1	$ 35	$ 77
Increase in Allowance at Modification	$ 0	$ 0	$ 0	$ 0
Commercial Investor Real Estate Construction [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Obligors | obligor	0	0	0	0
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 0	$ 0	$ 0	$ 0
Increase in Allowance at Modification	$ 0	$ 0	$ 0	$ 0
Residential First Mortgage [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Obligors | obligor	118	99	843	435
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 16	$ 16	$ 116	$ 77
Increase in Allowance at Modification	$ 1	$ 2	$ 5	$ 7
Home Equity Line [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Obligors | obligor	21	1	75	6
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 1	$ 0	$ 5	$ 1
Increase in Allowance at Modification	$ 1	$ 0	$ 3	$ 0
Home Equity Loan [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Obligors | obligor	45	33	155	40
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 3	$ 3	$ 11	$ 4
Increase in Allowance at Modification	$ 0	$ 0	$ 0	$ 0
Consumer Credit Card [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Obligors | obligor	0	1	2	1
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 0	$ 0	$ 0	$ 0
Increase in Allowance at Modification	$ 0	$ 0	$ 0	$ 0
OtherConsumerExitPortfoliosMember
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Obligors | obligor	0	0	0	0
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 0	$ 0	$ 0	$ 0
Increase in Allowance at Modification	$ 0	$ 0	$ 0	$ 0
Other consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Obligors | obligor	0	16	4	68
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 0	$ 1	$ 0	$ 2
Increase in Allowance at Modification	$ 0	$ 0	$ 0	$ 0
Commercial Portfolio Segment [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Obligors | obligor	17	29	46	85
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 58	$ 29	$ 121	$ 83
Increase in Allowance at Modification	$ 0	$ 0	$ 0	$ 0
Total Investor Real Estate [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Obligors | obligor	2	1	4	7
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 0	$ 1	$ 35	$ 77
Increase in Allowance at Modification	$ 0	$ 0	$ 0	$ 0
Consumer Portfolio Segment [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Obligors | obligor	184	150	1,079	550
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 20	$ 20	$ 132	$ 84
Increase in Allowance at Modification	$ 2	$ 2	$ 8	$ 7

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

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