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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, 2021 USD ($) obligor	Jun. 30, 2020 USD ($) obligor	Jun. 30, 2021 USD ($) obligor	Jun. 30, 2020 USD ($) obligor
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Obligors | obligor	202	120	462	244
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 120	$ 128	$ 194	$ 214
Increase in Allowance at Modification	$ 2	$ 1	$ 5	$ 2
Commercial And Industrial [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Obligors | obligor	15	67	41	93
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 20	$ 120	$ 50	$ 194
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	8	5	14	10
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 2	$ 3	$ 3	$ 5
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	1	0	1	1
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 1	$ 0	$ 1	$ 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	4	3	6	7
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 69	$ 0	$ 76	$ 1
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	1
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	161	31	336	83
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 26	$ 4	$ 61	$ 11
Increase in Allowance at Modification	$ 2	$ 1	$ 5	$ 2
Home Equity Line [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Obligors | obligor	3	0	5	0
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 1	$ 0	$ 1	$ 0
Increase in Allowance at Modification	$ 0	$ 0	$ 0	$ 0
Home Equity Loan [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Obligors | obligor	6	12	7	27
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 1	$ 1	$ 1	$ 2
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	0	11
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 0	$ 0	$ 0	$ 0
Increase in Allowance at Modification	$ 0	$ 0	$ 0	$ 0
Indirect-vehicles and other consumer [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Obligors | obligor	4	1	52	11
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 0	$ 0	$ 1	$ 0
Increase in Allowance at Modification	$ 0	$ 0	$ 0	$ 0
Commercial Portfolio Segment [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Obligors | obligor	24	72	56	104
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 23	$ 123	$ 54	$ 200
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	4	3	6	8
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 69	$ 0	$ 76	$ 1
Increase in Allowance at Modification	$ 0	$ 0	$ 0	$ 0
Consumer Portfolio Segment [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Obligors | obligor	174	45	400	132
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 28	$ 5	$ 64	$ 13
Increase in Allowance at Modification	$ 2	$ 1	$ 5	$ 2

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

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