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Leases - Summary of Detailed Information About Right Of Use Assets Explanatory (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Leased right-of-use assets      
Impairment charge for year $ 0 $ (827) $ (8)
Lease liabilities      
At 1 January 1,635 1,697  
At 31 December 1,671 1,635 1,697
Lease liabilities [member]      
Lease liabilities      
At 1 January 1,635 1,697  
Translation adjustment (34) 43  
Addition of right-of-use assets 210 166  
Arising on acquisition (note 30) 88 12  
Disposals (20) (44)  
Remeasurements 56 19  
Payments (328) (326)  
Discount unwinding 64 68  
At 31 December 1,671 1,635 1,697
Leased right-of-use assets [member]      
Leased right-of-use assets      
At 1 January, net carrying amount 1,550 1,652  
Translation adjustment (34) 41  
Transfer from/(to) owned assets (10) (7)  
Additions at cost 210 166  
Arising on acquisition (note 30) 88 12  
Disposals at net carrying amount (18) (45)  
Adjustment as a result of remeasurement of lease liability 56 19  
Depreciation charge for year (278) (279)  
Impairment charge for year   (9)  
At 31 December, net carrying amount 1,564 1,550 1,652
Leased right-of-use assets [member] | Cost [member]      
Leased right-of-use assets      
At 1 January, net carrying amount 2,069 1,937  
At 31 December, net carrying amount 2,259 2,069 1,937
Leased right-of-use assets [member] | Accumulated depreciation [member]      
Leased right-of-use assets      
At 1 January, net carrying amount   (285)  
At 31 December, net carrying amount     (285)
Leased right-of-use assets [member] | Accumulated depreciation (and impairment charges) [member]      
Leased right-of-use assets      
At 1 January, net carrying amount (519)    
At 31 December, net carrying amount (695) (519)  
Land and buildings [member] | Lease liabilities [member]      
Lease liabilities      
At 1 January 1,228 1,263  
Translation adjustment (24) 30  
Reclassification   (6)  
Addition of right-of-use assets 96 59  
Arising on acquisition (note 30) 77 12  
Disposals (14) (31)  
Remeasurements 45 9  
Payments (164) (162)  
Discount unwinding 52 54  
At 31 December 1,296 1,228 1,263
Land and buildings [member] | Leased right-of-use assets [member]      
Leased right-of-use assets      
At 1 January, net carrying amount 1,151 1,221  
Translation adjustment (24) 28  
Transfer from/(to) owned assets 0 (5)  
Additions at cost 96 59  
Arising on acquisition (note 30) 77 12  
Disposals at net carrying amount (12) (32)  
Adjustment as a result of remeasurement of lease liability 45 9  
Depreciation charge for year (138) (132)  
Impairment charge for year   (9)  
At 31 December, net carrying amount 1,195 1,151 1,221
Land and buildings [member] | Leased right-of-use assets [member] | Cost [member]      
Leased right-of-use assets      
At 1 January, net carrying amount 1,419 1,354  
At 31 December, net carrying amount 1,573 1,419 1,354
Land and buildings [member] | Leased right-of-use assets [member] | Accumulated depreciation [member]      
Leased right-of-use assets      
At 1 January, net carrying amount   (133)  
At 31 December, net carrying amount     (133)
Land and buildings [member] | Leased right-of-use assets [member] | Accumulated depreciation (and impairment charges) [member]      
Leased right-of-use assets      
At 1 January, net carrying amount (268)    
At 31 December, net carrying amount (378) (268)  
Plant and machinery [member] | Lease liabilities [member]      
Lease liabilities      
At 1 January 350 382  
Translation adjustment (9) 12  
Reclassification   5  
Addition of right-of-use assets 92 82  
Arising on acquisition (note 30) 11 0  
Disposals (5) (11)  
Remeasurements 9 7  
Payments (139) (139)  
Discount unwinding 10 12  
At 31 December 319 350 382
Plant and machinery [member] | Leased right-of-use assets [member]      
Leased right-of-use assets      
At 1 January, net carrying amount 342 378  
Translation adjustment (9) 11  
Transfer from/(to) owned assets (10) (2)  
Additions at cost 92 82  
Arising on acquisition (note 30) 11 0  
Disposals at net carrying amount (5) (11)  
Adjustment as a result of remeasurement of lease liability 9 7  
Depreciation charge for year (117) (123)  
Impairment charge for year   0  
At 31 December, net carrying amount 313 342 378
Plant and machinery [member] | Leased right-of-use assets [member] | Cost [member]      
Leased right-of-use assets      
At 1 January, net carrying amount 553 508  
At 31 December, net carrying amount 581 553 508
Plant and machinery [member] | Leased right-of-use assets [member] | Accumulated depreciation [member]      
Leased right-of-use assets      
At 1 January, net carrying amount   (130)  
At 31 December, net carrying amount     (130)
Plant and machinery [member] | Leased right-of-use assets [member] | Accumulated depreciation (and impairment charges) [member]      
Leased right-of-use assets      
At 1 January, net carrying amount (211)    
At 31 December, net carrying amount (268) (211)  
Other [member] | Lease liabilities [member]      
Lease liabilities      
At 1 January 57 52  
Translation adjustment (1) 1  
Reclassification   1  
Addition of right-of-use assets 22 25  
Arising on acquisition (note 30) 0  
Disposals (1) (2)  
Remeasurements 2 3  
Payments (25) (25)  
Discount unwinding 2 2  
At 31 December 56 57 52
Other [member] | Leased right-of-use assets [member]      
Leased right-of-use assets      
At 1 January, net carrying amount 57 53  
Translation adjustment (1) 2  
Transfer from/(to) owned assets 0    
Additions at cost 22 25  
Arising on acquisition (note 30) 0 0  
Disposals at net carrying amount (1) (2)  
Adjustment as a result of remeasurement of lease liability 2 3  
Depreciation charge for year (23) (24)  
Impairment charge for year   0  
At 31 December, net carrying amount 56 57 53
Other [member] | Leased right-of-use assets [member] | Cost [member]      
Leased right-of-use assets      
At 1 January, net carrying amount 97 75  
At 31 December, net carrying amount 105 97 75
Other [member] | Leased right-of-use assets [member] | Accumulated depreciation [member]      
Leased right-of-use assets      
At 1 January, net carrying amount   (22)  
At 31 December, net carrying amount     $ (22)
Other [member] | Leased right-of-use assets [member] | Accumulated depreciation (and impairment charges) [member]      
Leased right-of-use assets      
At 1 January, net carrying amount (40)    
At 31 December, net carrying amount $ (49) $ (40)