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Loans and the Allowance for Credit Losses (Loans By Class Modified In TDR) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($) obligor	Jun. 30, 2021 USD ($) obligor	Jun. 30, 2022 USD ($) obligor	Jun. 30, 2021 USD ($) obligor
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Obligors | obligor	487	202	926	462
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 106	$ 120	$ 210	$ 194
Increase in Allowance at Modification	$ 2	$ 2	$ 6	$ 5
Commercial And Industrial [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Obligors | obligor	10	15	20	41
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 23	$ 20	$ 60	$ 50
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	6	8	9	14
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 1	$ 2	$ 3	$ 3
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	1
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 0	$ 1	$ 0	$ 1
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	1	4	2	6
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 27	$ 69	$ 35	$ 76
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	368	161	725	336
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 48	$ 26	$ 100	$ 61
Increase in Allowance at Modification	$ 1	$ 2	$ 4	$ 5
Home Equity Line [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Obligors | obligor	32	3	54	5
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 2	$ 1	$ 4	$ 1
Increase in Allowance at Modification	$ 1	$ 0	$ 2	$ 0
Home Equity Loan [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Obligors | obligor	68	6	110	7
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 5	$ 1	$ 8	$ 1
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	0	2	0
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	2	4	4	52
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 0	$ 0	$ 0	$ 1
Increase in Allowance at Modification	$ 0	$ 0	$ 0	$ 0
Commercial Portfolio Segment [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Obligors | obligor	16	24	29	56
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 24	$ 23	$ 63	$ 54
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	1	4	2	6
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 27	$ 69	$ 35	$ 76
Increase in Allowance at Modification	$ 0	$ 0	$ 0	$ 0
Consumer Portfolio Segment [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Obligors | obligor	470	174	895	400
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 55	$ 28	$ 112	$ 64
Increase in Allowance at Modification	$ 2	$ 2	$ 6	$ 5

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