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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, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |  |
90 plus DPD, Accrual Loans | $ 178 |  | $ 221
Total Accrual | 83,408 |  | 84,521
Nonaccrual | 666 |  | 745
Loans, net of unearned income | 84,074 | [1] | 85,266
Financing Receivable, Total 30 Days for more past due | 391 |  | 554
Commercial And Industrial [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
90 plus DPD, Accrual Loans | 4 |  | 7
Total Accrual | 42,156 |  | 42,452
Nonaccrual | 472 |  | 418
Loans, net of unearned income | 42,628 |  | 42,870
Financing Receivable, Total 30 Days for more past due | 39 |  | 66
Commercial Real Estate Mortgage - Owner-Occupied [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
90 plus DPD, Accrual Loans | 2 |  | 1
Total Accrual | 5,305 |  | 5,308
Nonaccrual | 76 |  | 97
Loans, net of unearned income | 5,381 |  | 5,405
Financing Receivable, Total 30 Days for more past due | 9 |  | 6
Commercial Real Estate Construction - Owner-Occupied [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
90 plus DPD, Accrual Loans | 0 |  | 0
Total Accrual | 235 |  | 291
Nonaccrual | 10 |  | 9
Loans, net of unearned income | 245 |  | 300
Financing Receivable, Total 30 Days for more past due | 0 |  | 1
Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
90 plus DPD, Accrual Loans | 6 |  | 8
Total Accrual | 47,696 |  | 48,051
Nonaccrual | 558 |  | 524
Loans, net of unearned income | 48,254 |  | 48,575
Financing Receivable, Total 30 Days for more past due | 48 |  | 73
Commercial Investor Real Estate Mortgage [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
90 plus DPD, Accrual Loans | 0 |  | 0
Total Accrual | 5,445 |  | 5,280
Nonaccrual | 4 |  | 114
Loans, net of unearned income | 5,449 |  | 5,394
Financing Receivable, Total 30 Days for more past due | 4 |  | 3
Commercial Investor Real Estate Construction [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
90 plus DPD, Accrual Loans | 0 |  | 0
Total Accrual | 1,799 |  | 1,869
Nonaccrual | 0 |  | 0
Loans, net of unearned income | 1,799 |  | 1,869
Financing Receivable, Total 30 Days for more past due | 0 |  | 0
Total Investor Real Estate [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
90 plus DPD, Accrual Loans | 0 |  | 0
Total Accrual | 7,244 |  | 7,149
Nonaccrual | 4 |  | 114
Loans, net of unearned income | 7,248 |  | 7,263
Financing Receivable, Total 30 Days for more past due | 4 |  | 3
Residential First Mortgage [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
90 plus DPD, Accrual Loans | 119 |  | 156
Total Accrual | 17,000 |  | 16,522
Nonaccrual | 51 |  | 53
Loans, net of unearned income | 17,051 |  | 16,575
Financing Receivable, Total 30 Days for more past due | 216 |  | 301
Home Equity Line [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
90 plus DPD, Accrual Loans | 21 |  | 19
Total Accrual | 4,012 |  | 4,493
Nonaccrual | 45 |  | 46
Loans, net of unearned income | 4,057 |  | 4,539
Financing Receivable, Total 30 Days for more past due | 39 |  | 54
Home Equity Loan [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
90 plus DPD, Accrual Loans | 13 |  | 13
Total Accrual | 2,580 |  | 2,705
Nonaccrual | 8 |  | 8
Loans, net of unearned income | 2,588 |  | 2,713
Financing Receivable, Total 30 Days for more past due | 23 |  | 30
Indirect-vehicles [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
90 plus DPD, Accrual Loans | 2 |  | 4
Total Accrual | 621 |  | 934
Nonaccrual | 0 |  | 0
Loans, net of unearned income | 621 |  | 934
Financing Receivable, Total 30 Days for more past due | 11 |  | 23
Indirect-other consumer [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
90 plus DPD, Accrual Loans | 3 |  | 5
Total Accrual | 2,157 |  | 2,431
Nonaccrual | 0 |  | 0
Loans, net of unearned income | 2,157 |  | 2,431
Financing Receivable, Total 30 Days for more past due | 15 |  | 25
Consumer Credit Card [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
90 plus DPD, Accrual Loans | 12 |  | 14
Total Accrual | 1,131 |  | 1,213
Nonaccrual | 0 |  | 0
Loans, net of unearned income | 1,131 |  | 1,213
Financing Receivable, Total 30 Days for more past due | 23 |  | 28
Other consumer |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
90 plus DPD, Accrual Loans | 2 |  | 2
Total Accrual | 967 |  | 1,023
Nonaccrual | 0 |  | 0
Loans, net of unearned income | 967 |  | 1,023
Financing Receivable, Total 30 Days for more past due | 12 |  | 17
Consumer Portfolio Segment [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
90 plus DPD, Accrual Loans | 172 |  | 213
Total Accrual | 28,468 |  | 29,321
Nonaccrual | 104 |  | 107
Loans, net of unearned income | 28,572 |  | 29,428
Financing Receivable, Total 30 Days for more past due | 339 |  | 478
Financial Asset, 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receiable, Past Due between 30 and 89 Days | 66 |  | 103
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 | 11 |  | 22
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 | 13 |  | 23
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 | 30 |  | 41
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 |  | 11
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 |  | 7
Financial Asset, 60 to 89 Days Past Due [Member] | Indirect-vehicles [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receiable, Past Due between 30 and 89 Days | 2 |  | 4
Financial Asset, 60 to 89 Days Past Due [Member] | Indirect-other consumer [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receiable, Past Due between 30 and 89 Days | 5 |  | 8
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] | Other consumer |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receiable, Past Due between 30 and 89 Days | 2 |  | 3
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 | 53 |  | 80
Financial Asset, 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receiable, Past Due between 30 and 89 Days | 147 |  | 230
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 | 24 |  | 37
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 | 5 |  | 4
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 |  | 1
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 | 29 |  | 42
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 | 4 |  | 3
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 | 4 |  | 3
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 | 67 |  | 104
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 | 12 |  | 24
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 | 7 |  | 10
Financial Asset, 30 to 59 Days Past Due [Member] | Indirect-vehicles [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receiable, Past Due between 30 and 89 Days | 7 |  | 15
Financial Asset, 30 to 59 Days Past Due [Member] | Indirect-other consumer [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receiable, Past Due between 30 and 89 Days | 7 |  | 12
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 | 6 |  | 8
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 | 8 |  | 12
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 | $ 114 |  | $ 185
[1] | These amounts consist of fees that are not allocated at the loan level and loans serviced by third parties wherein Regions does not receive FICO or vintage information.

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