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Other financial assets (Tables)
 12 Months Ended
Dec. 31, 2020
Disclosure Of Other Financial Assets [Abstract]  
Summary of other financial assets including non-quasi equity loans to equity accounted units

Non-current
2020
US$m
Current
2020
US$m
Total
2020
US$m
Non-current
2019
US$m
Current
2019
US$m
Total
2019
US$m
Derivative financial instruments
531 134 665 308 58 366 
Equity shares and quoted funds
66 9 75 52 9 61 
Other investments, including loans(a)
231 2,668 2,899 236 2,603 2,839 
Loans to equity accounted units
1 40 41 39 — 39 
Total
829 2,851 3,680 635 2,670 3,305 
(a)Current “Other investments, including loans” includes US$2,538 million (2019: US$2,584 million) of highly liquid financial assets held in managed investment funds classified as held for trading.