Loans and the Allowance for Credit Losses (Schedule of Aging Analysis Of Days Past Due (DPD) For Each Portfolio Class) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	$ 131	$ 189
Financing Receivable, Total 30 Days for more past due	445	468
Total Accrual	94,216	87,333
Nonaccrual	495	451
Loans, net of unearned income	94,711	87,784
Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	4	5
Financing Receivable, Total 30 Days for more past due	81	69
Total Accrual	49,258	43,453
Nonaccrual	333	305
Loans, net of unearned income	49,591	43,758
Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	0	1
Financing Receivable, Total 30 Days for more past due	5	5
Total Accrual	5,138	5,235
Nonaccrual	29	52
Loans, net of unearned income	5,167	5,287
Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	0	0
Financing Receivable, Total 30 Days for more past due	0	0
Total Accrual	276	253
Nonaccrual	6	11
Loans, net of unearned income	282	264
Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	4	6
Financing Receivable, Total 30 Days for more past due	86	74
Total Accrual	54,672	48,941
Nonaccrual	368	368
Loans, net of unearned income	55,040	49,309
Commercial Investor Real Estate Mortgage [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	0	0
Financing Receivable, Total 30 Days for more past due	1	0
Total Accrual	6,236	5,438
Nonaccrual	59	3
Loans, net of unearned income	6,295	5,441
Commercial Investor Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	0	0
Financing Receivable, Total 30 Days for more past due	0	0
Total Accrual	1,824	1,586
Nonaccrual	0	0
Loans, net of unearned income	1,824	1,586
Total Investor Real Estate [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	0	0
Financing Receivable, Total 30 Days for more past due	1	0
Total Accrual	8,060	7,024
Nonaccrual	59	3
Loans, net of unearned income	8,119	7,027
Residential First Mortgage [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	76	123
Financing Receivable, Total 30 Days for more past due	200	227
Total Accrual	18,370	17,479
Nonaccrual	29	33
Loans, net of unearned income	18,399	17,512
Home Equity Line [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	17	21
Financing Receivable, Total 30 Days for more past due	37	42
Total Accrual	3,489	3,704
Nonaccrual	32	40
Loans, net of unearned income	3,521	3,744
Home Equity Loan [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	8	12
Financing Receivable, Total 30 Days for more past due	19	23
Total Accrual	2,508	2,503
Nonaccrual	7	7
Loans, net of unearned income	2,515	2,510
Consumer Credit Card [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	13	12
Financing Receivable, Total 30 Days for more past due	30	27
Total Accrual	1,186	1,184
Nonaccrual	0	0
Loans, net of unearned income	1,186	1,184
OtherConsumerExitPortfoliosMember
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	1	2
Financing Receivable, Total 30 Days for more past due	11	16
Total Accrual	662	1,071
Nonaccrual	0	0
Loans, net of unearned income	662	1,071
Other consumer
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	12	13
Financing Receivable, Total 30 Days for more past due	61	59
Total Accrual	5,269	5,427
Nonaccrual	0	0
Loans, net of unearned income	5,269	5,427
Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	127	183
Financing Receivable, Total 30 Days for more past due	358	394
Total Accrual	31,484	31,368
Nonaccrual	68	80
Loans, net of unearned income	31,552	31,448
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	95	96
Financial Asset, 60 to 89 Days Past Due [Member] \| Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	25	29
Financial Asset, 60 to 89 Days Past Due [Member] \| Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	2	1
Financial Asset, 60 to 89 Days Past Due [Member] \| Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	0	0
Financial Asset, 60 to 89 Days Past Due [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	27	30
Financial Asset, 60 to 89 Days Past Due [Member] \| Commercial Investor Real Estate Mortgage [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	0	0
Financial Asset, 60 to 89 Days Past Due [Member] \| Commercial Investor Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	0	0
Financial Asset, 60 to 89 Days Past Due [Member] \| Total Investor Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	0	0
Financial Asset, 60 to 89 Days Past Due [Member] \| Residential First Mortgage [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	35	31
Financial Asset, 60 to 89 Days Past Due [Member] \| Home Equity Line [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	6	6
Financial Asset, 60 to 89 Days Past Due [Member] \| Home Equity Loan [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	3	4
Financial Asset, 60 to 89 Days Past Due [Member] \| Consumer Credit Card [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	6	6
Financial Asset, 60 to 89 Days Past Due [Member] \| OtherConsumerExitPortfoliosMember
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	3	4
Financial Asset, 60 to 89 Days Past Due [Member] \| Other consumer
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	15	15
Financial Asset, 60 to 89 Days Past Due [Member] \| Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	68	66
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	219	183
Financial Asset, 30 to 59 Days Past Due [Member] \| Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	52	35
Financial Asset, 30 to 59 Days Past Due [Member] \| Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	3	3
Financial Asset, 30 to 59 Days Past Due [Member] \| Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	0	0
Financial Asset, 30 to 59 Days Past Due [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	55	38
Financial Asset, 30 to 59 Days Past Due [Member] \| Commercial Investor Real Estate Mortgage [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	1	0
Financial Asset, 30 to 59 Days Past Due [Member] \| Commercial Investor Real Estate Construction [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	0	0
Financial Asset, 30 to 59 Days Past Due [Member] \| Total Investor Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	1	0
Financial Asset, 30 to 59 Days Past Due [Member] \| Residential First Mortgage [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	89	73
Financial Asset, 30 to 59 Days Past Due [Member] \| Home Equity Line [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	14	15
Financial Asset, 30 to 59 Days Past Due [Member] \| Home Equity Loan [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	8	7
Financial Asset, 30 to 59 Days Past Due [Member] \| Consumer Credit Card [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	11	9
Financial Asset, 30 to 59 Days Past Due [Member] \| OtherConsumerExitPortfoliosMember
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	7	10
Financial Asset, 30 to 59 Days Past Due [Member] \| Other consumer
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	34	31
Financial Asset, 30 to 59 Days Past Due [Member] \| Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Financing Receiable, Past Due between 30 and 89 Days	$ 163	$ 145

Loans and the Allowance for Credit Losses (Schedule of Aging Analysis Of Days Past Due (DPD) For Each Portfolio Class) (Details) - USD ($)
$ in Millions