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Cash and cash equivalents - Summary of cash and cash equivalents (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Cash and cash equivalents [abstract]
Cash at bank and in hand	$ 1,150	$ 978
Money market funds, reverse repurchase agreements and other cash equivalents(a)	9,231	7,049
Balance per Group balance sheet and Group cash flow statement	10,381	$ 8,027
Reverse repurchase agreements	1,200
Fair value of collateral	$ 1,260

X

- Definition

The fair value of collateral held that is permitted to be sold or repledged in the absence of default by the owner of the collateral. [Refer: At fair value [member]]

+ References

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2020-01-01
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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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No definition available.

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- Definition

The amount of instruments purchased for resale in reverse repurchase agreements and cash collateral on securities borrowed. [Refer: Repurchase agreements and cash collateral on securities lent]

+ References

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- Definition

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

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