Cash and Cash Equivalents (Excluding Overdrafts) - Summary of Cash and Cash Equivalents for Purpose of Cash Flow Statement (Detail) - GBP (£) £ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents	£ 937	£ 1,116
Bank overdrafts		(3)
Total cash and cash equivalents	£ 937	£ 1,113	£ 434	£ 525

The amount that has been withdrawn from an account in excess of existing cash balances. This is considered a short-term extension of credit by the bank. [Refer: Cash and cash equivalents]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The amount of cash and cash equivalents in the statement of cash flows when different from the amount of cash and cash equivalents in the statement of financial position. [Refer: Cash and cash equivalents]

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- Definition

Cash and cash equivalents including cash balances of assets held for sale.

+ References

No definition available.

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