Non-interest income (Details) - GBP (£) £ in Millions	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023
Disclosure of detailed information about financial instruments [line items]
Net fees and commissions	£ 1,219	£ 1,144
Trading income
Foreign exchange	140	125
Interest rate	298	315
Credit	(82)	(34)
Changes in fair value of own debt and derivative liabilities attributable to own credit risk
-debt securities in issue	(7)	9
Equity, commodities and other	1	3
Income from trading activities	350	418
Profit on redemption of own debt		2
Rental income on operating lease assets and investment property	116	118
Changes in fair value of financial assets and liabilities designated at fair value through profit or loss	(43)	(3)
Hedge ineffectiveness	12	49
Loss on disposal of amortised cost assets and liabilities	(1)	(2)
Loss on disposal of fair value through other comprehensive income assets	(4)	(24)
Share of profit/(loss) of associated entities	9	(17)
Other income	68	316
Other operating income	157	439
Non-interest income	£ 1,726	2,001
UBIDAC
Changes in fair value of own debt and derivative liabilities attributable to own credit risk
Recycled to profit or loss on disposal of businesses		305
Foreign exchange reserve \| UBIDAC
Changes in fair value of own debt and derivative liabilities attributable to own credit risk
Recycled to profit or loss on disposal of businesses		£ 305

No definition available.

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

- Definition

The amount of income or expense relating to fees and commissions.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 85
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_85&doctype=Standard
-URIDate 2023-03-23

+ Details

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

- Definition

The gain (loss) recognised in profit or loss on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-Paragraph 24C
-Subparagraph a
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24C_a_i&doctype=Standard
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-Paragraph 24C
-Subparagraph b
-Clause ii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24C_b_ii&doctype=Standard
-URIDate 2023-03-23

+ Details

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

- Definition

The amount of operating income (expense) that the entity does not separately disclose in the same statement or note.

+ References

+ Details

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

- Definition

The amount of reclassification adjustments related to exchange differences when the financial statements of foreign operations are translated, net of tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 21
-IssueDate 2023-01-01
-Paragraph 48
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=21&code=ifrs-tx-2023-en-r&anchor=para_48&doctype=Standard
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 92
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_92&doctype=Standard
-URIDate 2023-03-23

+ Details

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

- Definition

The amount of income recognised from rental activities.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2023-03-23

+ Details

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

- Definition

The entity's share of the profit (loss) of associates accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method; Profit (loss)]

+ References

+ Details

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

- Definition

The amount of income (expense) relating to trading assets and liabilities.

+ References

+ Details

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

- References

No definition available.

+ Details

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

- Definition

The amount of trading income (expense) relating to equity instruments. [Refer: Equity instruments held; Trading income (expense)]

+ References

+ Details

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

- Definition

The amount of trading income (expense) relating to foreign exchange contracts. [Refer: Trading income (expense)]

+ References

+ Details

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

- Definition

Gains (losses) from changes in fair value of own debt securities attributable to own credit risk

+ References

No definition available.

+ Details

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

- Definition

The amount represents gains (losses) on assets and liabilities designated at fair value through profit or loss.

+ References

No definition available.

+ Details

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

- Definition

Gains (losses) on disposal of assets and liabilities at amortised cost

+ References

No definition available.

+ Details

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

- Definition

Gains (losses) on disposal of financial assets measured at fair value through other comprehensive income

+ References

No definition available.

+ Details

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

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

No definition available.

+ Details

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

- Definition

The aggregate amount of the entity's non-interest income.

+ References

No definition available.

+ Details

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

- Definition

The amount of operating income (expense) that the entity does not separately disclose in the same statement or note.

+ References

No definition available.

+ Details

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

- Definition

The amount of trading income (expense) relating to credit.

+ References

No definition available.

+ Details

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

- Definition

The amount of trading income (expense) relating to interest rate.

+ References

No definition available.

+ Details

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

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=nwg_UbiDacMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ComponentsOfEquityAxis=nwg_ReserveOfExchangeDifferencesOnTranslationAndHedgesOfNetInvestmentsInForeignOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: