Leases - Summary of maturities of operating lease payments (Detail) - GBP (£) £ in Millions	Dec. 31, 2022	Dec. 31, 2021
Disclosure of maturity analysis of operating lease payments [line items]
Undiscounted lease liabilities	£ 746	£ 804
Lease liabilities included in the balance sheet	605	633
Current	71	68
Non-current	534	565
Less than one year [Member]
Disclosure of maturity analysis of operating lease payments [line items]
Undiscounted lease liabilities	94	92
One to five years [member]
Disclosure of maturity analysis of operating lease payments [line items]
Undiscounted lease liabilities	320	318
More than five years [member]
Disclosure of maturity analysis of operating lease payments [line items]
Undiscounted lease liabilities	£ 332	£ 394

The amount of current lease liabilities. [Refer: Lease liabilities]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2022-03-24
-Paragraph 47
-Subparagraph b
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-URIDate 2022-03-24

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The amount of non-current lease liabilities. [Refer: Lease liabilities]

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Undiscounted operating lease payments due.

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