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Related-party transactions (Tables)
 12 Months Ended
Dec. 31, 2020
Related party transactions [abstract]  
Summary of transactions and balances with equity accounted units


Note
2020
US$m
2019
US$m
2018
US$m
Income statement items
Purchases from equity accounted units
(960)(1,155)(1,209)
Sales to equity accounted units
271 268 493 

Cash flow statement items
Dividends from equity accounted units
594 669 800 
Net funding of equity accounted units
(43)(33)(9)

Balance sheet items
Investments in equity accounted units(a)
153,764 3,971 4,299 
Loans to equity accounted units
1941 39 38 
Trade and other receivables: amounts due from equity accounted units(b)
18251 259 278 
Trade and other payables: amounts due to equity accounted units
24(241)(271)(223)
(a)Investments in equity accounted units include quasi equity loans. Further information about investments in equity accounted units is set out in notes 34 and 35.
(b)This includes prepayments of tolling charges.