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Cash and cash equivalents - Summary of cash and cash equivalents (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash And Cash Equivalents [Abstract]
Cash at bank and in hand	$ 1,035	$ 956
Money market funds and other cash equivalents	9,515	7,245
Balance per Group balance sheet	10,550	8,201
Bank overdrafts repayable on demand (unsecured)	(3)	(12)
Balance per Group cash flow statement	$ 10,547	$ 8,189	$ 9,354	$ 12,400

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The amount that has been withdrawn from an account in excess of existing cash balances.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

+ References

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

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