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Cash and cash equivalents - Summary of cash and cash equivalents (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash and cash equivalents [abstract]
Cash at bank and in hand	$ 1,344	$ 1,150
Money market funds, reverse repurchase agreements and other cash equivalents	11,463	9,231
Balance per Group balance sheet	12,807	10,381
Bank overdrafts repayable on demand (unsecured)	(2)	0
Balance per Group cash flow statement	12,805	10,381	$ 8,027	$ 10,889
Reverse repurchase agreements	4,520	1,200
Fair value of collateral	$ 4,638	$ 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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- 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The amount that has been withdrawn from an account in excess of existing cash balances.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]

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

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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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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]

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

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