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Receivables and other assets - Summary of trade and other receivables (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Trade and other receivables [abstract]    
Non-current trade receivables $ 1 $ 1
Non-current other financial receivables 339 286
Non-current receivables relating to net investment in finance leases 29 52
Non-current amounts due from equity accounted units 0 0
Non-current other receivables 369 123
Non-current prepayment of tolling charges to jointly controlled entities 218 221
Non-Current pension supluses 782 984
Non-current other prepayments 58 49
Total 1,796 1,716
Current trade receivables 2,543 2,097
Current other financial receivables 332 453
Current receivables relating to net investment in finance leases 9 11
Current amounts due from equity accounted units 33 38
Current other receivables 422 209
Current prepayment of tolling charges to jointly controlled entities 0 0
Current pension surpluses 0 0
Current other prepayments 305 219
Total 3,644 3,027
Trade receivables 2,544 2,098
Other financial receivables 671 739
Receivables relating to net investment in finance leases 38 63
Amounts due from equity accounted units 33 38
Other receivables 791 332
Prepayment of tolling charges to jointly controlled entities 218 221
Pension surpluses 782 984
Other prepayments 363 268
Total $ 5,440 $ 4,743