Related parties - Impact to income statement (Details) - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Related parties
Loans to customers - amortised cost	£ 400,326	£ 381,433
Customer deposits	£ 433,490	431,377
Related party, minimum ownership interest held (in %)	10.00%
Associates, joint ventures and equity shares
Related parties
Investments accounted for using equity method and other equity investments	£ 812	813
Loans to customers - amortised cost	4	13
Customer deposits	2	12
Other comprehensive income	(22)	(8)
Other operating income	19	(11)
Associates and joint ventures
Related parties
Investments accounted for using equity method	690	668
Customer deposits	1	2
Other operating income	19	(11)
Equity shares
Related parties
Investments other than investments accounted for using equity method	122	145
Loans to customers - amortised cost	4	13
Customer deposits	1	10
Other comprehensive income	£ (22)	£ (8)
Related party, minimum ownership interest held (in %)	10.00%

The amount of deposit liabilities from customers held by the entity at amortised cost. [Refer: Financial liabilities at amortised cost]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard
-URIDate 2024-03-27

+ Details

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

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

- Definition

The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 8
-IssueDate 2024-01-01
-Paragraph 24
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_24_a&doctype=Standard
-URIDate 2024-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2024-01-01
-Paragraph B16
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_B16&doctype=Appendix&subtype=B
-URIDate 2024-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 54
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_e&doctype=Standard
-URIDate 2024-03-27

+ Details

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

- Definition

The amount of investments other than investments accounted for using the equity method. [Refer: Investments accounted for using equity method]

+ References

+ Details

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

- Definition

The amount of loans and advances the entity has made to customers at amortised cost. [Refer: Loans and advances to customers; Financial assets at amortised cost]

+ References

+ Details

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

- Definition

Investments accounted for using equity method and other equity investments

+ References

No definition available.

+ Details

Name:	nwg_InvestmentsAccountedForUsingEquityMethodAndOtherEquityInvestments
Namespace Prefix:	nwg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of other comprehensive income from related party transactions.

+ References

No definition available.

+ Details

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

- Definition

The amount of other comprehensive income from related party transactions.

+ References

No definition available.

+ Details

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

- Definition

Represents the minimum stake held as condition for related party.

+ References

No definition available.

+ Details

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

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=nwg_AssociatesJointVenturesJvAndEquitySharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=nwg_AssociatesAndJointVenturesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=nwg_EquitySharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: