Loans and the Allowance for Credit Losses (Schedule of Aging Analysis Of Days Past Due (DPD) For Each Portfolio Class) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	$ 135	$ 189
Financing Receivable, Total 30 Days for more past due	388	468
Total Accrual	93,089	87,333
Nonaccrual	369	451
Loans, net of unearned income	93,458	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	41	69
Total Accrual	48,235	43,453
Nonaccrual	257	305
Loans, net of unearned income	48,492	43,758
Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	1	1
Financing Receivable, Total 30 Days for more past due	6	5
Total Accrual	5,189	5,235
Nonaccrual	29	52
Loans, net of unearned income	5,218	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	256	253
Nonaccrual	10	11
Loans, net of unearned income	266	264
Commercial Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	5	6
Financing Receivable, Total 30 Days for more past due	47	74
Total Accrual	53,680	48,941
Nonaccrual	296	368
Loans, net of unearned income	53,976	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	0	0
Total Accrual	5,889	5,438
Nonaccrual	3	3
Loans, net of unearned income	5,892	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	1,720	1,586
Nonaccrual	0	0
Loans, net of unearned income	1,720	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	0	0
Total Accrual	7,609	7,024
Nonaccrual	3	3
Loans, net of unearned income	7,612	7,027
Residential First Mortgage [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	78	123
Financing Receivable, Total 30 Days for more past due	191	227
Total Accrual	17,865	17,479
Nonaccrual	27	33
Loans, net of unearned income	17,892	17,512
Home Equity Line [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	16	21
Financing Receivable, Total 30 Days for more past due	32	42
Total Accrual	3,514	3,704
Nonaccrual	36	40
Loans, net of unearned income	3,550	3,744
Home Equity Loan [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	9	12
Financing Receivable, Total 30 Days for more past due	20	23
Total Accrual	2,517	2,503
Nonaccrual	7	7
Loans, net of unearned income	2,524	2,510
Consumer Credit Card [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	11	12
Financing Receivable, Total 30 Days for more past due	24	27
Total Accrual	1,172	1,184
Nonaccrual	0	0
Loans, net of unearned income	1,172	1,184
OtherConsumerExitPortfoliosMember
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	2	2
Financing Receivable, Total 30 Days for more past due	12	16
Total Accrual	775	1,071
Nonaccrual	0	0
Loans, net of unearned income	775	1,071
Other consumer
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	14	13
Financing Receivable, Total 30 Days for more past due	62	59
Total Accrual	5,957	5,427
Nonaccrual	0	0
Loans, net of unearned income	5,957	5,427
Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
90 plus DPD, Accrual Loans	130	183
Financing Receivable, Total 30 Days for more past due	341	394
Total Accrual	31,800	31,368
Nonaccrual	70	80
Loans, net of unearned income	31,870	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	78	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	10	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	12	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	34	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	5	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	5	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	16	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	66	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	175	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	27	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	30	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	0	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	0	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	79	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	11	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	8	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	32	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	$ 145	$ 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