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Trade and other receivables - Summary of trade and other receivables (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Trade and other receivables [abstract]    
Non-current trade receivables $ 1 $ 0
Non-current other financial receivables 286 240
Non-current finance lease receivables 52 0
Non-current receivables due from related parties 0 0
Non-current other receivables 123 129
Non-current prepayment of tolling charges to jointly controlled entities 221 228
Non-Current pension supluses 984 935
Non-current other prepayments 49 53
Total 1,716 1,585
Current trade receivables 2,097 2,167
Current other financial receivables 453 550
Current finance lease receivables 11 0
Current amounts due from equity accounted units 38 50
Current other receivables 209 226
Current prepayment of tolling charges to jointly controlled entities 0 0
Current pension surpluses 0 0
Current other prepayments 219 186
Total 3,027 3,179
Trade receivables 2,098 2,167
Other financial receivables 739 790
Finance lease receivables 63 0
Amounts due from equity accounted units 38 50
Other receivables 332 355
Prepayment of tolling charges to jointly controlled entities 221 228
Surplus In Plan 984 935
Other prepayments 268 239
Total $ 4,743 $ 4,764