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Receivables and other assets - Summary of trade and other receivables (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Trade and other receivables [abstract]    
Non-current trade receivables $ 0 $ 1
Non-current other financial receivables 133 339
Non-current receivables relating to net investment in finance leases 2 29
Non-current amounts due from equity accounted units 0 0
Non-current other receivables 392 369
Non-current prepayment of tolling charges to jointly controlled entities 183 218
Non-Current pension supluses 1,070 782
Non-current other prepayments 414 58
Total 2,194 1,796
Current trade receivables 2,241 2,543
Current other financial receivables 305 332
Current receivables relating to net investment in finance leases 13 9
Current amounts due from equity accounted units 68 33
Current other receivables 418 422
Current prepayment of tolling charges to jointly controlled entities 0 0
Current pension surpluses 0 0
Current other prepayments 529 305
Total 3,574 3,644
Trade receivables 2,241 2,544
Other financial receivables 438 671
Receivables relating to net investment in finance leases 15 38
Amounts due from equity accounted units 68 33
Other receivables 810 791
Prepayment of tolling charges to jointly controlled entities 183 218
Pension surpluses 1,070 782
Other prepayments 943 363
Total 5,768 5,440
Net of provisions for doubtful debts (57) (59)
Amount held in trust fund $ 388 $ 410