Name:	ifrs-full_DisclosureOfContingentLiabilitiesLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The amount of provision for legal proceedings. [Refer: Other provisions]

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 37
-IssueDate 2020-01-01
-Section Example 10 A court case
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2020-en-r&doctype=Illustrative%20Examples&dita_xref=IAS37_IE_C_ex10_TI
-URIDate 2020-01-01

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 37
-IssueDate 2020-01-01
-Paragraph 87
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2020-en-r&anchor=para_87&doctype=Standard
-URIDate 2020-01-01

Name:	ifrs-full_LegalProceedingsProvision
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The amount used (ie incurred and charged against the provision) for other provisions. [Refer: Other provisions]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 37
-IssueDate 2020-01-01
-Paragraph 84
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2020-en-r&anchor=para_84_c&doctype=Standard
-URIDate 2020-01-01

Name:	ifrs-full_ProvisionUsedOtherProvisions
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount agreed to be paid by the entity in order to resolve investigation by the State of Maryland.

No definition available.

Name:	nwg_AmountAgreedToPayToResolveInvestigation
Namespace Prefix:	nwg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount claimed by plaintiff in legal matter.

No definition available.

Name:	nwg_AmountOfLegalClaim
Namespace Prefix:	nwg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The amount of damages awarded from other party.

No definition available.

Name:	nwg_DamagesAwarded
Namespace Prefix:	nwg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount of fee income earned from fiduciary activities.

No definition available.

Name:	nwg_FeeIncomeEarnedFromFiduciaryActivities
Namespace Prefix:	nwg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

n/a

No definition available.

Name:	nwg_FinancialServicesCompensationSchemeAbstract
Namespace Prefix:	nwg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Number of plaintiffs that have filed claims pertaining to a loss contingency.

No definition available.

Name:	nwg_IfrsLossContingencyNumberOfPlaintiffs
Namespace Prefix:	nwg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The amount of cash outflow reducing the contingent liability.

No definition available.

Name:	nwg_LitigationSettlementPaid
Namespace Prefix:	nwg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The amount of litigation settlement value.

No definition available.

Name:	nwg_LitigationSettlementValue
Namespace Prefix:	nwg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The amount of total transaction value .

No definition available.

Name:	nwg_MaximumTotalTransactionValue
Namespace Prefix:	nwg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Number of class actions in which certain members of the group named as defendants relating to JPY LIBOR and Euroyen TIBOR..

No definition available.

Name:	nwg_NumberOfClassActionsMembersNamedAsDefendants
Namespace Prefix:	nwg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Number of failed US banks on behalf of these US Federal Deposit Insurance Corporation served claim.

No definition available.

Name:	nwg_NumberOfFailedUsBanksServedClaim
Namespace Prefix:	nwg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Number of non-class action.

No definition available.

Name:	nwg_NumberOfNonClassAction
Namespace Prefix:	nwg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Number of non-class actions pending.

No definition available.

Name:	nwg_NumberOfNonClassActionsPending
Namespace Prefix:	nwg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Number of swap execution facilities.

No definition available.

Name:	nwg_NumberOfSwapExecutionFacilities
Namespace Prefix:	nwg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents number of terrorist attacks claimed.

No definition available.

Name:	nwg_NumberOfTerroristAttackClaims
Namespace Prefix:	nwg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents number of terrorist attacks claims dismissed by United states district court for the eastern district of New York.

No definition available.

Name:	nwg_NumberOfTerroristAttacksClaimsDismissedInCourt
Namespace Prefix:	nwg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Amount of payments made for value added tax assessments.

No definition available.

Name:	nwg_PaymentsForValueAddedTaxAssessments
Namespace Prefix:	nwg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Penalty to be levied as a percentage of value added tax.

No definition available.

Name:	nwg_PenaltyToBeLeviedAsPercentageOfValueAddedTax
Namespace Prefix:	nwg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The amount of tax assessments.

No definition available.

Name:	nwg_TaxAssessments
Namespace Prefix:	nwg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

n/a

No definition available.

Name:	nwg_TrusteeAndOtherFiduciaryActivitiesAbstract
Namespace Prefix:	nwg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

n/a

No definition available.

Name:	nwg_Uk2008RightsIssueShareholderLitigationAbstract
Namespace Prefix:	nwg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The amount of value-added-tax specified in open tax matters.

No definition available.

Name:	nwg_ValueAddedTaxSpecifiedInOpenTaxMatters
Namespace Prefix:	nwg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Name:	dei_LegalEntityAxis=nwg_RbsFinancialProductsIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	ifrs-full_ClassesOfFinancialLiabilitiesAxis=nwg_PaymentProtectionInsuranceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	ifrs-full_ClassesOfProvisionsAxis=nwg_LegalProceedingProvisionTreatmentOfTrackerMortgageCustomersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	ifrs-full_ClassesOfProvisionsAxis=nwg_InternalReviewFromLegalProceedingProvisionTreatmentOfTrackerMortgageCustomersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	nwg_InvestigationAuthoritiesAxis=nwg_ForeignExchangeRelatedInvestigationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	ifrs-full_ClassesOfContingentLiabilitiesAxis=nwg_LegalProceedingsNomuraHoldingAmericaIncAndSubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	ifrs-full_ClassesOfContingentLiabilitiesAxis=nwg_LegalProceedingLondonInterbankOfferedRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	ifrs-full_ClassesOfContingentLiabilitiesAxis=nwg_LegalProceedingFxAntitrustLitigationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	ifrs-full_ClassesOfContingentLiabilitiesAxis=nwg_LegalProceedingInterestRateSwapsAntitrustLitigationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	ifrs-full_ClassesOfContingentLiabilitiesAxis=nwg_LegalProceedingMadoffLitigationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	ifrs-full_ClassesOfContingentLiabilitiesAxis=ifrs-full_TaxContingentLiabilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: