Loan impairment provisions (Details) - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Off-Balance Sheet Exposures
Loan impairment provisions
ECL provisions	£ 100	£ 100
Contingent Liability
Loan impairment provisions
ECL (release)/charge	(5)	(34)
Financial assets (Other)
Loan impairment provisions
Financial Assets	30,895	46,145
ECL (release)/charge	3	3
FVOCI
Loan impairment provisions
ECL provisions	3	5
FVOCI \| Financial assets (Other)
Loan impairment provisions
ECL (release)/charge	0	(2)
Loans and advances \| Financial assets at amortised cost and fair value through other comprehensive income
Loan impairment provisions
Financial Assets	377,153	369,827
ECL provisions	£ 3,434	£ 3,806
Expected Credit Loss, Provision Coverage	0.91%	1.03%
ECL (release)/charge	£ 337	£ (1,173)
Amounts written off	482	876
Loans and advances \| Financial assets at amortised cost and fair value through other comprehensive income \| Individual
Loan impairment provisions
Amounts written off	168	455
Loans and advances \| Financial assets at amortised cost and fair value through other comprehensive income \| Collective
Loan impairment provisions
Amounts written off	314	421
Cash at central banks \| Financial assets (Other)
Loan impairment provisions
Financial Assets	143,300	176,300
Debt securities \| Financial assets (Other)
Loan impairment provisions
Financial Assets	29,900	44,900
Business loans
Loan impairment provisions
ECL provisions	3,434	3,806
Stage 1 \| Loans and advances \| Financial assets at amortised cost and fair value through other comprehensive income
Loan impairment provisions
Financial Assets	325,224	330,824
ECL provisions	£ 632	£ 302
Expected Credit Loss, Provision Coverage	0.19%	0.09%
ECL (release)/charge	£ (290)	£ (1,317)
Stage 2 \| Loans and advances \| Financial assets at amortised cost and fair value through other comprehensive income
Loan impairment provisions
Financial Assets	46,833	33,981
ECL provisions	£ 1,043	£ 1,478
Expected Credit Loss, Provision Coverage	2.23%	4.35%
ECL (release)/charge	£ 393	£ (164)
Stage 3 \| Loans and advances \| Financial assets at amortised cost and fair value through other comprehensive income
Loan impairment provisions
Financial Assets	5,096	5,022
ECL provisions	£ 1,759	£ 2,026
Expected Credit Loss, Provision Coverage	34.52%	40.34%
ECL (release)/charge	£ 234	£ 308
Stage 3 \| Loans and advances \| Financial assets at amortised cost and fair value through other comprehensive income \| Individual
Loan impairment provisions
Financial Assets	1,121	1,215
ECL provisions	287	363
ECL (release)/charge	54	20
Stage 3 \| Loans and advances \| Financial assets at amortised cost and fair value through other comprehensive income \| Collective
Loan impairment provisions
Financial Assets	3,975	3,807
ECL provisions	1,472	1,663
ECL (release)/charge	£ 180	£ 288

The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2023-01-01
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 16
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b
-URIDate 2022-03-24

+ Details

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

- Definition

The decrease in financial assets resulting from write-off. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph IG20B
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_IG20B&doctype=Implementation%20Guidance
-URIDate 2022-03-24

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 35H
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_35H&doctype=Standard
-URIDate 2022-03-24

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 35I
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_35I_c&doctype=Standard
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_DecreaseThroughWriteoffFinancialAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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

- Definition

The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 35H
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_35H&doctype=Standard
-URIDate 2022-03-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 35M
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_35M&doctype=Standard
-URIDate 2022-03-24

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 35N
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_35N&doctype=Standard
-URIDate 2022-03-24

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 35I
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_35I&doctype=Standard
-URIDate 2022-03-24

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 25
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_25&doctype=Standard
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_FinancialAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of impairment loss on financial assets. [Refer: Financial assets; Impairment loss]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2023-01-01
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 20
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_20_e&doctype=Standard&book=b
-URIDate 2022-03-24

+ Details

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

- Definition

The rate of provision coverage for expected credit losses.

+ References

No definition available.

+ Details

Name:	nwg_ExpectedCreditLossProvisionCoverage
Namespace Prefix:	nwg_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Details

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

- Details

Name:	ifrs-full_ClassesOfFinancialAssetsAxis=nwg_OtherFinancialAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfFinancialAssetsAxis=ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=nwg_LoansAndAdvancesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfFinancialAssetsAxis=nwg_FinancialAssetsAtAmortisedCostAndFairValueThroughOtherComprehensiveIncomeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ImpairmentOfFinancialAssetsAxis=ifrs-full_FinancialAssetsIndividuallyAssessedForCreditLossesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ImpairmentOfFinancialAssetsAxis=ifrs-full_FinancialAssetsCollectivelyAssessedForCreditLossesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=nwg_CashAtCentralBanksMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=ifrs-full_DebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=ifrs-full_ConsumerLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	nwg_StagesOfImpairmentAxis=nwg_StageOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	nwg_StagesOfImpairmentAxis=nwg_StageTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	nwg_StagesOfImpairmentAxis=nwg_StageThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: