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Cash and cash equivalents - Summary of cash and cash equivalents (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash And Cash Equivalents [Abstract]
Cash at bank and in hand	$ 740	$ 1,035
Money market funds and other cash equivalents	10,033	9,515
Balance per Group balance sheet	10,773	10,550
Bank overdrafts repayable on demand (unsecured)	(1)	(3)
Cash and cash equivalents included in Assets held for sale	117
Balance per Group cash flow statement	$ 10,889	$ 10,547	$ 8,189	$ 9,354

X

- Definition

The amount that has been withdrawn from an account in excess of existing cash balances.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

+ References

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- Definition

The amount of cash on hand and demand deposits. [Refer: Cash on hand]

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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]

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- Definition

The amount of cash and cash equivalents that are classified as a part of a disposal group held for sale. [Refer: Cash and cash equivalents; Disposal groups classified as held for sale [member]]

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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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A classification of cash equivalents representing short-term investments. [Refer: Cash equivalents]

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