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Cash and cash equivalents (Tables)
 12 Months Ended
Dec. 31, 2021
Cash and cash equivalents [abstract]  
Summary of cash and cash equivalents

2021
US$m
2020
US$m
Cash at bank and in hand
1,344 1,150 
Money market funds, reverse repurchase agreements and other cash equivalents(a)
11,463 9,231 
Balance per Group balance sheet12,807 10,381 
Bank overdrafts repayable on demand (unsecured)
21(2)— 
Balance per Group cash flow statement
12,805 10,381 
(a)We continue to purchase securities under resale agreements (“reverse repurchase agreements”). At 31 December 2021 we held US$4,520 million (2020: US$1,200 million) of reverse repurchase agreements, measured at amortised cost and reported within cash and cash equivalents as they are highly liquid products maturing within three months. We accepted collateral of investment grade quality in respect of these reverse repurchase agreements, with a fair value of US$4,638 million as at 31 December 2021 (2020: US$1,260 million). Collateral is not recognised on our balance sheet and in the event of the counterparty's default we would be able to sell it.