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Intangible Assets (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($) unit | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Intangible Assets [Line Items] |  |  |
Number of Reporting Units | unit | 3 |  |
Impairment of Intangible Assets (Excluding Goodwill) | $ | $ 0 | $ 0 | $ 0

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- Definition Intangible Assets [Line Items] + References No definition available. + Details
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Namespace Prefix: | rf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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- Definition Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment. + References No definition available. + Details
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