The amount that has been withdrawn from an account in excess of existing cash balances.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

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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 Equivalents (Excluding Overdrafts) - Summary of Cash and Cash Equivalents for Purpose of Cash Flow Statement (Detail) - GBP (£) £ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash and cash equivalents [line items]
Cash and cash equivalents	£ 518	£ 1,459
Bank overdrafts - continuing operations	(15)	(35)
Total cash and cash equivalents	630	£ 1,424	£ 1,671	£ 511
Asset held for sale [member]
Cash and cash equivalents [line items]
Cash and cash equivalents	£ 127