Cash and Cash Equivalents (Excluding Overdrafts) - Summary of Cash and Cash Equivalents for Purpose of Cash Flow Statement (Detail) - GBP (£) £ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash and cash equivalents [line items]
Cash and cash equivalents	£ 437	£ 568
Bank overdrafts	(3)	(43)
Total cash and cash equivalents	£ 434	£ 525	£ 630	£ 1,424

The amount that has been withdrawn from an account in excess of existing cash balances.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]

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- Definition

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

+ References

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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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Cash and cash equivalents1 [line items].

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