Financial instruments - Liquidity risk - Additional (Details) £ in Millions, $ in Billions	12 Months Ended
Dec. 31, 2025 GBP (£)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 GBP (£)
Disclosure of detailed information about financial instruments
Maximum amount of term debt maturing in any 12-month period \| $		$ 2.0
Weighted average maturity of gross debt portfolio to be maintained	5 years
Derivative financial liabilities	£ 111		£ 185
Current derivative financial liabilities	7		59
Non-current derivative financial liabilities	104		126
Derivative financial assets	112		74
Current derivative financial assets	50		35
Non-current derivative financial assets	62		39
Committed bank facility	2,600	$ 3.5
Hedging instruments \| Fair value hedges
Disclosure of detailed information about financial instruments
Derivative financial liabilities	70		162
Derivative financial assets	10		21
Hedging instruments \| Cash flow hedges
Disclosure of detailed information about financial instruments
Derivative financial liabilities	5		15
Derivative financial assets	51		43
Instruments not designated as hedges
Disclosure of detailed information about financial instruments
Derivative financial liabilities	36		8
Derivative financial assets	£ 51		£ 10

The amount of current derivative financial assets. [Refer: Derivative financial assets]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of current derivative financial liabilities. [Refer: Derivative financial liabilities]

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The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

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