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Trade and other receivables - Summary of trade and other receivables (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Trade And Other Receivables [Abstract]    
Non-current trade receivables   $ 1
Non-current other financial receivables $ 240 178
Non-current other receivables 129 348
Non-current prepayment of tolling charges to jointly controlled entities 228 269
Non-current pension surpluses 935 871
Non-current other prepayments 53 57
Total 1,585 1,724
Current trade receivables 2,167 2,314
Current other financial receivables 550 462
Current amounts due from equity accounted units 50 30
Current other receivables 226 358
Current other prepayments 186 279
Total 3,179 3,443
Trade receivables 2,167 2,315
Other financial receivables 790 640
Amounts due from equity accounted units 50 30
Other receivables 355 706
Prepayment of tolling charges to jointly controlled entities 228 269
Pension surpluses 935 871
Other prepayments 239 336
Total $ 4,764 $ 5,167