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Loans and Leases - Balances Of Commercial Loan Portfolio Classes, Disaggregated By PD Grade (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | $ 55,435 | $ 58,232
Commercial and industrial | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, originated year one | 5,883 | 9,331
Financing receivable, originated year two | 4,356 | 5,308
Financing receivable, originated year three | 3,957 | 2,812
Financing receivable, originated year four | 1,847 | 1,829
Financing receivable, originated year five | 1,362 | 1,240
Financing receivable, originated prior to year five | 2,652 | 2,267
LMC, Non-Revolving Loans | 5,139 | 5,404
Revolving loans | 6,255 | 4,793
Revolving Loans converted to term loans | 65 | 120
Loans and leases | 31,516 | 33,104
Revolving loans converted to term loan during period | 0 | 50
Commercial and industrial | PD Grade 1 -12 | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, originated year one | 5,822 | 9,060
Financing receivable, originated year two | 4,208 | 5,138
Financing receivable, originated year three | 3,809 | 2,628
Financing receivable, originated year four | 1,682 | 1,748
Financing receivable, originated year five | 1,294 | 1,161
Financing receivable, originated prior to year five | 2,551 | 2,145
LMC, Non-Revolving Loans | 5,139 | 5,404
Revolving loans | 5,972 | 4,571
Revolving Loans converted to term loans | 13 | 60
Loans and leases | 30,490 | 31,915
Commercial and industrial | PD Grade 13 | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, originated year one | 20 | 89
Financing receivable, originated year two | 37 | 93
Financing receivable, originated year three | 74 | 70
Financing receivable, originated year four | 59 | 31
Financing receivable, originated year five | 38 | 37
Financing receivable, originated prior to year five | 48 | 64
LMC, Non-Revolving Loans | 0 | 0
Revolving loans | 154 | 127
Revolving Loans converted to term loans | 4 | 1
Loans and leases | 434 | 512
Commercial and industrial | PD Grade 14 15 16 | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, originated year one | 41 | 182
Financing receivable, originated year two | 111 | 77
Financing receivable, originated year three | 74 | 114
Financing receivable, originated year four | 106 | 50
Financing receivable, originated year five | 30 | 42
Financing receivable, originated prior to year five | 53 | 58
LMC, Non-Revolving Loans | 0 | 0
Revolving loans | 129 | 95
Revolving Loans converted to term loans | 48 | 59
Loans and leases | 592 | 677
Commercial real estate | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases | 12,194 | 12,275
Commercial real estate | CRE | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, originated year one | 2,230 | 2,555
Financing receivable, originated year two | 2,307 | 3,348
Financing receivable, originated year three | 2,876 | 1,888
Financing receivable, originated year four | 1,395 | 1,257
Financing receivable, originated year five | 913 | 1,044
Financing receivable, originated prior to year five | 2,189 | 1,887
Revolving loans | 284 | 277
Revolving Loans converted to term loans | 0 | 19
Loans and leases | 12,194 | 12,275
Commercial real estate | PD Grade 1 -12 | CRE | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, originated year one | 2,216 | 2,477
Financing receivable, originated year two | 2,264 | 3,311
Financing receivable, originated year three | 2,814 | 1,750
Financing receivable, originated year four | 1,208 | 1,140
Financing receivable, originated year five | 806 | 946
Financing receivable, originated prior to year five | 2,054 | 1,800
Revolving loans | 259 | 259
Revolving Loans converted to term loans | 0 | 19
Loans and leases | 11,621 | 11,702
Commercial real estate | PD Grade 13 | CRE | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, originated year one | 4 | 48
Financing receivable, originated year two | 26 | 24
Financing receivable, originated year three | 50 | 117
Financing receivable, originated year four | 171 | 75
Financing receivable, originated year five | 69 | 71
Financing receivable, originated prior to year five | 91 | 54
Revolving loans | 0 | 0
Revolving Loans converted to term loans | 0 | 0
Loans and leases | 411 | 389
Commercial real estate | PD Grade 14 15 16 | CRE | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing receivable, originated year one | 10 | 30
Financing receivable, originated year two | 17 | 13
Financing receivable, originated year three | 12 | 21
Financing receivable, originated year four | 16 | 42
Financing receivable, originated year five | 38 | 27
Financing receivable, originated prior to year five | 44 | 33
Revolving loans | 25 | 18
Revolving Loans converted to term loans | 0 | 0
Loans and leases | $ 162 | $ 184

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