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Other financial assets
 12 Months Ended
Dec. 31, 2021
Disclosure Of Other Financial Assets [Abstract]  
Other financial assets
19 Other financial assets

Non-current
2021
US$m
Current
2021
US$m
Total
2021
US$m
Non-current
2020
US$m
Current
2020
US$m
Total
2020
US$m
Derivative financial instruments
210 62 272 531 134 665 
Equity shares and quoted funds
98 19 117 66 9 75 
Other investments, including loans(a)
220 2,462 2,682 231 2,668 2,899 
Loans to equity accounted units
— — — 1 40 41 
Total528 2,543 3,071 829 2,851 3,680 
(a)Current “Other investments, including loans” includes US$2,401 million (2020: US$2,538 million) of highly liquid financial assets held in managed investment funds classified as held for trading.
Detailed information relating to other financial assets is given in note 29.