XML 80 R66.htm IDEA: XBRL DOCUMENT
v3.21.2

Commitments, Contingencies and Guarantees (Narrative) (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Commitments and Contingencies Disclosure [Abstract] |  |
Loss Contingency, Range of Possible Loss, Portion Not Accrued | $ 20 |
Long-term Purchase Commitment [Line Items] |  |
Fannie Mae DUS Servicing Portfolio, Amount | 4,800 | $ 4,500
Maximum Quantifiable Fannie Mae DUS Loss Share Guarantee | 1,600 | 1,500
Estimated Fair Value of the Fannie Mae DUS Loss Share Guarantee | $ 5 | $ 5

X
- Definition Estimated Fair Value of the Fannie Mae DUS Loss Share Guarantee + References No definition available. + Details
Name: | rf_EstimatedFairValueoftheFannieMaeDUSLossShareGuarantee
Namespace Prefix: | rf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fannie Mae DUS Servicing Portfolio, Amount + References No definition available. + Details
Name: | rf_FannieMaeDUSServicingPortfolioAmount
Namespace Prefix: | rf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Maximum Quantifiable Fannie Mae DUS Loss Share Guarantee + References No definition available. + Details
Name: | rf_MaximumQuantifiableFannieMaeDUSLossShareGuarantee
Namespace Prefix: | rf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The difference between the maximum amount of estimated loss and the amount recorded as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 05 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99385795&loc=d3e12631-108344 + Details
Name: | us-gaap_LossContingencyRangeOfPossibleLossPortionNotAccrued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant