Derivative Financial Instruments and Hedge Accounting - Summary of Interest Rate and Cross Currency Swaps (Detail) € in Millions, £ in Millions	Dec. 31, 2022 GBP (£)	Dec. 31, 2022 EUR (€)	Dec. 31, 2021 GBP (£)
Disclousre of Detailed Information About Interest Rate and Cross Currency Swaps [Line Items]
Notional amount	£ 1,448	€ 300	£ 1,146
Hedging Contract One [Member]
Disclousre of Detailed Information About Interest Rate and Cross Currency Swaps [Line Items]
Notional amount	£ 87	€ 100
Borrowings, interest rate	1.375%	1.375%
Average rate of hedging instrument	3.51%	3.51%
Average price of hedging instrument	1.1295	1.1295
Hedging Contract Two [Member]
Disclousre of Detailed Information About Interest Rate and Cross Currency Swaps [Line Items]
Notional amount	£ 160	€ 181
Borrowings, interest rate	1.375%	1.375%
Average rate of hedging instrument	3.402%	3.402%
Average price of hedging instrument	1.206	1.206
Hedging Contract Three [Member]
Disclousre of Detailed Information About Interest Rate and Cross Currency Swaps [Line Items]
Notional amount	£ 23	€ 19
Borrowings, interest rate	1.375%	1.375%
Average rate of hedging instrument	1.36%	1.36%
Average price of hedging instrument	1.206	1.206

The average price of a hedging instrument. [Refer: Hedging instruments [member]]

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The average rate of a hedging instrument. [Refer: Hedging instruments [member]]

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The interest rate on borrowings. [Refer: Borrowings]

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The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

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Disclousre of Detailed Information About Interest Rate and Cross Currency Swaps

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