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Related party transactions (Details)	6 Months Ended
	Jun. 30, 2025
Related party transactions
Threshold period considered to disclose as related party even after percentage of ownership	12 months
Threshold percentage of ownership in other entity or third party holding interests in reporting entity	20.00%

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- References

No definition available.

+ Details

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

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- Definition

Threshold percentage of ownership in other entity or third party holding interests in reporting entity for disclosure as a related party

+ References

No definition available.

+ Details

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

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- Definition

Threshold period considered to disclose as related party even after percentage of ownership in other entity or third party holding interests in reporting entity falls below threshold percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	nwg_
Data Type:	xbrli:durationItemType
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