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Net operating costs (excluding items shown separately) - Summary of net operating costs (excluding items shown separately) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Operating Costs [Line Items]      
Raw materials, consumables, repairs and maintenance $ 9,957 $ 8,490 $ 9,485
Amortisation of intangible assets 178 161 133
Depreciation of property, plant and equipment 4,519 4,118 4,251
Employment costs 5,513 4,770 4,522
Shipping and other freight costs 3,275 2,088 2,257
Decrease/(increase) in finished goods and work in progress 29 (47) 42
Royalties 3,878 2,763 2,501
Amounts charged by equity accounted units 1,160 958 1,136
Net foreign exchange losses/(gains) 14 300 (52)
Other external costs 4,018 3,083 3,627
Loss on sale of property, plant and equipment 53 50 31
Gain on recognition of new wharf at Kitimat, Canada (336) 0 0
Provisions (including exchange differences on provisions) 1,906 894 753
Research and development 65 45 45
Costs included above capitalised or shown separately as exploration and evaluation costs (646) (708) (651)
Other operating income (893) (711) (773)
Net operating costs (excluding items shown separately) 32,690 26,254 27,307
Purchases of the other investors' share of production 121 129 291
Payments for short-term leases 502 314 327
Payments for variable lease components 34 30 15
Operating costs capitalised 445 537 469
Exploration and evaluation costs $ 201 $ 171 $ 182