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Servicing of Financial Assets (Tables) | 9 Months Ended
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Sep. 30, 2025
Transfers and Servicing of Financial Assets [Abstract] |
Schedule of Residential Mortgage Servicing Rights Under The Fair Value Measurement Method | The table below presents an analysis of residential MSRs under the fair value measurement method:
| Three Months Ended September 30 |  | Nine Months Ended September 30 |  |
| 2025 |  | 2024 |  | 2025 |  | 2024 |  |
| (In millions)
Carrying value, beginning of period | $ | 988 |  |  | $ | 1,020 |  |  | $ | 1,007 |  |  | $ | 906 |  |  |
Additions | 7 |  |  | 8 |  |  | 20 |  |  | 20 |  |  |
Purchases (1) | 8 |  |  | 4 |  | 26 |  |  | 134 |  |  |
Increase (decrease) in fair value(2): |  |  |  |  |  |  |  |  |
Due to change in valuation inputs or assumptions | 1 |  |  | (28) |  |  | 7 |  |  | 4 |  |  |
Economic amortization associated with borrower repayments (3) | (28) |  |  | (33) |  |  | (84) |  |  | (93) |  |  |
Carrying value, end of period | $ | 976 |  |  | $ | 971 |  |  | $ | 976 |  |  | $ | 971 |  |  |
_________ (1)Purchases of residential MSRs can be structured with cash hold back provisions, therefore the timing of payment may be made in future periods. (2)Included in mortgage income. Amounts presented exclude offsetting impact from related derivatives. (3)Includes both total loan payoffs as well as partial paydowns. Regions' MSR decay methodology is a discounted net cash flow approach.
Data And Assumptions Used In The Fair Value Calculation As Well As The Valuation's Sensitivity To Rate Fluctuations Related To Mortgage Servicing Rights | Data and assumptions used in the fair value calculation, as well as the valuation’s sensitivity to rate fluctuations, related to residential MSRs (excluding related derivative instruments) are as follows:
| September 30
| 2025 |  | 2024
| (Dollars in millions)
Unpaid principal balance | $ | 65,572 |  |  | $ | 68,361 |
Weighted-average CPR (%) | 7.7 | % |  | 9.0 | %
Estimated impact on fair value of a 10% increase | $ | (36) |  |  | $ | (46) |
Estimated impact on fair value of a 20% increase | $ | (69) |  |  | $ | (87) |
Option-adjusted spread (basis points) | 495 |  |  | 496 |
Estimated impact on fair value of a 10% increase | $ | (22) |  |  | $ | (21) |
Estimated impact on fair value of a 20% increase | $ | (44) |  |  | $ | (43) |
Weighted-average coupon interest rate | 3.9 | % |  | 3.8 | %
Weighted-average remaining maturity (months) | 291 |  | 298
Weighted-average servicing fee (basis points) | 27.5 |  |  | 27.3 |
us-gaap_ScheduleOfServicingAssetsAtFairValue(CommercialMortgage)TextBlock | The table below presents an analysis of commercial MSRs through non-DUS agency programs under the fair value measurement method:
| Three Months Ended September 30 |  | Nine Months Ended September 30 |  |
| 2025 |  | 2024 |  | 2025 |  | 2024 |  |
| (In millions)
Carrying value, beginning of period | $ | 93 |  |  | $ | 90 |  |  | $ | 97 |  |  | $ | 81 |  |  |
Additions | 3 |  |  | 5 |  |  | 8 |  | 16 |  |
Increase (decrease) in fair value(1): |  |  |  |  |  |  |  |  |
Due to change in valuation inputs or assumptions | — |  |  | (4) |  |  | (1) |  |  | 2 |  |  |
Economic amortization associated with borrower repayments (2) | (5) |  |  | (4) |  |  | (13) |  |  | (12) |  |  |
Carrying value, end of period | $ | 91 |  |  | $ | 87 |  |  | $ | 91 |  |  | $ | 87 |  |  |
_____ (1)Included in capital markets income. Amounts presented exclude offsetting impact from related derivatives. (2)Includes both total loan payoffs as well as partial paydowns. Regions' MSR decay methodology is a discounted net cash flow approach.
us-gaap_ScheduleOfAssumptionsForFairValueAsOfBalanceSheetDateOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrServicingLiabilities(Commercial Mortgage)TextBlock | Data and assumptions used in the fair value calculation, as well as the valuation’s sensitivity to rate fluctuations, related to commercial MSRs through non-DUS agency programs (excluding related derivative instruments) are as follows:
| September 30 |  |
| 2025 |  | 2024 |  |
| (Dollars in millions) |  |
Unpaid principal balance | $ | 8,063 |  |  | $ | 6,912 |  |  |
Weighted-average CPR (%) | 7.6 | % |  | 8.0 | % |  |
Estimated impact on fair value of a 10% increase | $ | (1) |  |  | $ | (1) |  |  |
Estimated impact on fair value of a 20% increase | $ | (3) |  |  | $ | (3) |  |  |
Weighted-average discount rate (%) | 8.2 | % |  | 7.1 | % |  |
Estimated impact on fair value of a 10% increase | $ | (3) |  |  | $ | (2) |  |  |
Estimated impact on fair value of a 20% increase | $ | (5) |  |  | $ | (4) |  |  |
Weighted-average coupon interest rate | 4.9 | % |  | 4.6 | % |  |
Weighted-average remaining maturity (months) | 144 |  | 154 |  |
Weighted-average servicing fee (basis points) | 24.7 |  | 27.6 |  |
Servicing Asset at Amortized Cost | The table below presents an analysis of commercial DUS MSRs under the amortization measurement method:
| Three Months Ended September 30 |  | Nine Months Ended September 30 |  |
| 2025 |  | 2024 |  | 2025 |  | 2024 |  |
| (In millions)
Carrying value, beginning of period | $ | 91 |  |  | $ | 85 |  |  | $ | 90 |  |  | $ | 87 |  |  |
Additions | 4 |  |  | 5 |  |  | 14 |  |  | 12 |  |  |
Economic amortization associated with borrower repayments (1) | (5) |  |  | (4) |  |  | (14) |  |  | (13) |  |  |
Carrying value, end of period | $ | 90 |  |  | $ | 86 |  |  | $ | 90 |  |  | $ | 86 |  |  |

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- Definition Tabular disclosure of all information related to the key inputs and assumptions (including, at a minimum, but not limited to, and if applicable, quantitative information about discount rates, expected prepayments including the expected weighted-average life of prepayable financial assets, and anticipated credit losses) used in measuring the fair value of assets or liabilities that relate to the transferor's continuing involvement with transferred financial assets, as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481326/860-20-50-4 + Details
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- Definition Tabular disclosure of activity in the balance of servicing assets subsequently measured at amortized cost. Includes, but is not limited to, beginning and ending balances, additions, disposals, and amortization. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481229/860-50-50-4 + Details
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- Definition Tabular disclosure of the activity in the balance of servicing assets (including a description of where changes in fair value are reported in the statement of income for each period for which results of operations are presented), including but not limited to, the following: beginning and ending balances, additions (for instance, through purchases of servicing assets), disposals, changes in fair value during the period resulting from changes in inputs or assumptions used in the valuation model, other changes in fair value along with a description of those changes, and other changes that affect the balance along with a description of those changes. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481229/860-50-50-3 + Details
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