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Property, Plant and Equipment - Schedule of Property Plant and Equipment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Total property, plant and equipment [1] $ 19,502 $ 19,317
Property, plant and equipment leased as right of use assets [member]    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Leased right-of-use assets (ii) [1] 1,564 1,550
Carrying Amount [Member]    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Beginning balance 17,767 17,922
Translation adjustment (338) 436
Reclassifications (4) (4)
Transfer from leased assets (note 20) 10 7
Additions at cost 1,554 996
Additions to leased mineral reserves (note 19) (i) [2] 10 14
Arising on acquisition (note 30) 521 122
Disposals at net carrying amount (169) (127)
Depreciation charge for year (1,413) (1,345)
Impairment charge for year (iii) [3]   (254)
Ending Balance 17,938 17,767
Cost/deemed cost [member] | Carrying Amount [Member]    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Beginning balance 30,814 29,372
Ending Balance 31,486 30,814
Accumulated depreciation (and impairment charges) [member] | Carrying Amount [Member]    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Beginning balance (13,047) (11,450)
Ending Balance (13,548) (13,047)
Land and buildings [member] | Property, plant and equipment leased as right of use assets [member]    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Leased right-of-use assets (ii) [1] 1,195 1,151
Land and buildings [member] | Carrying Amount [Member]    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Beginning balance 4,081 4,027
Translation adjustment (111) 109
Reclassifications 20 76
Transfer from leased assets (note 20) 0 5
Additions at cost 94 42
Additions to leased mineral reserves (note 19) (i) [2] 0  
Arising on acquisition (note 30) 86 42
Disposals at net carrying amount (63) (57)
Depreciation charge for year (146) (155)
Impairment charge for year (iii) [3]   (8)
Ending Balance 3,961 4,081
Land and buildings [member] | Cost/deemed cost [member] | Carrying Amount [Member]    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Beginning balance 5,928 5,653
Ending Balance 5,865 5,928
Land and buildings [member] | Accumulated depreciation (and impairment charges) [member] | Carrying Amount [Member]    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Beginning balance (1,847) (1,626)
Ending Balance (1,904) (1,847)
Plant and machinery [member] | Property, plant and equipment leased as right of use assets [member]    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Leased right-of-use assets (ii) [1] 313 342
Plant and machinery [member] | Carrying Amount [Member]    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Beginning balance 9,416 9,490
Translation adjustment (146) 232
Reclassifications 449 440
Transfer from leased assets (note 20) 10 2
Additions at cost 564 512
Additions to leased mineral reserves (note 19) (i) [2] 0  
Arising on acquisition (note 30) 346 72
Disposals at net carrying amount (92) (60)
Depreciation charge for year (1,153) (1,082)
Impairment charge for year (iii) [3]   (190)
Ending Balance 9,394 9,416
Plant and machinery [member] | Cost/deemed cost [member] | Carrying Amount [Member]    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Beginning balance 19,400 18,292
Ending Balance 19,754 19,400
Plant and machinery [member] | Accumulated depreciation (and impairment charges) [member] | Carrying Amount [Member]    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Beginning balance (9,984) (8,802)
Ending Balance (10,360) (9,984)
Assets in course of construction [member] | Property, plant and equipment leased as right of use assets [member]    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Leased right-of-use assets (ii) [1] 56 57
Assets in course of construction [member] | Carrying Amount [Member]    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Beginning balance 572 718
Translation adjustment (22) 13
Reclassifications (501) (572)
Transfer from leased assets (note 20) 0  
Additions at cost 883 414
Additions to leased mineral reserves (note 19) (i) [2] 0  
Arising on acquisition (note 30) 8 1
Disposals at net carrying amount (3) (2)
Depreciation charge for year 0  
Impairment charge for year (iii) [3]   0
Ending Balance 937 572
Assets in course of construction [member] | Cost/deemed cost [member] | Carrying Amount [Member]    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Beginning balance 612 757
Ending Balance 977 612
Assets in course of construction [member] | Accumulated depreciation (and impairment charges) [member] | Carrying Amount [Member]    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Beginning balance (40) (39)
Ending Balance (40) (40)
Mineral-bearing land [member] | Carrying Amount [Member]    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Beginning balance 3,698 3,687
Translation adjustment (59) 82
Reclassifications 28 52
Transfer from leased assets (note 20) 0  
Additions at cost 13 28
Additions to leased mineral reserves (note 19) (i) [2] 10 14
Arising on acquisition (note 30) 81 7
Disposals at net carrying amount (11) (8)
Depreciation charge for year (114) (108)
Impairment charge for year (iii) [3]   (56)
Ending Balance 3,646 3,698
Mineral-bearing land [member] | Cost/deemed cost [member] | Carrying Amount [Member]    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Beginning balance 4,874 4,670
Ending Balance 4,890 4,874
Mineral-bearing land [member] | Accumulated depreciation (and impairment charges) [member] | Carrying Amount [Member]    
Disclosure of Detailed Information about Property, Plant and Equipment [Line Items]    
Beginning balance (1,176) (983)
Ending Balance $ (1,244) $ (1,176)
[1] See note 20 for more detailed information on right-of-use assets and lease liabilities of the Group.
[2] Additions relating to leased mineral reserves which fall outside the scope of IFRS 16.
[3] The combined impairment charge in notes 13 and 20 of $nil million (2020: $263 million; 2019: $9 million). [The charge in 2020 principally relates to the write-down of specific assets relating to our UK business within our Europe Materials segment following a strategic review of its operational footprint, together with impairments booked in respect of two CGUs in the same segment. An extended period of lower than anticipated demand and reduced price growth resulting from the combined economic impacts of Brexit and COVID-19 were the primary drivers of the impairment charge. The recoverable amount of these assets is their value-in-use of $185 million and is calculated using real pre-tax discount rates ranging from 7.3% to 7.7%].