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Property, Plant and Equipment - Summary of Property Plant and Equipment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance $ 104  
Ending Balance 96 $ 104
Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 190 200
Additions 16 16
Reclassification (1) (1)
Disposals (12) (19)
Reclassified to assets held for sale   (6)
Currency translation effects (6) 0
Ending Balance 187 190
Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance (86) (87)
Depreciation charge (20) (20)
Disposals 12 12
Reclassified to assets held for sale   6
Currency translation effects 3 3
Ending Balance (91) (86)
Energy Infrastructure Assets [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 864  
Ending Balance 713 864
Energy Infrastructure Assets [Member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 1,142 1,129
Additions 59 90
Disposals (119) (70)
Currency translation effects (23) (7)
Ending Balance 1,059 1,142
Energy Infrastructure Assets [Member] | Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance (278) (215)
Depreciation charge (111) (127)
Impairment (1) (1)
Disposals 27 53
Currency translation effects 17 12
Ending Balance (346) (278)
Land [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 17  
Ending Balance 17 17
Land [member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 17 18
Additions 0 0
Reclassification 0 0
Disposals 0  
Reclassified to assets held for sale   0
Currency translation effects 0 (1)
Ending Balance 17 17
Land [member] | Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 0 0
Depreciation charge 0 0
Disposals 0 0
Reclassified to assets held for sale   0
Currency translation effects 0 0
Ending Balance 0 0
Buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 62  
Ending Balance $ 56 $ 62
Buildings [member] | Bottom of range [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Estimated Useful Life Range 5 years 5 years
Buildings [member] | Top of range [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Estimated Useful Life Range 20 years 20 years
Buildings [member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance $ 104 $ 112
Additions 0 0
Reclassification 5 2
Disposals (5) (6)
Reclassified to assets held for sale   (4)
Currency translation effects (2) 0
Ending Balance 102 104
Buildings [member] | Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance (42) (43)
Depreciation charge (10) (7)
Disposals 5 3
Reclassified to assets held for sale   4
Currency translation effects 1 1
Ending Balance (46) (42)
Equipments [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 18  
Ending Balance $ 18 $ 18
Equipments [Member] | Bottom of range [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Estimated Useful Life Range 2 years 2 years
Equipments [Member] | Top of range [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Estimated Useful Life Range 20 years 20 years
Equipments [Member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance $ 62 $ 67
Additions 2 2
Reclassification 9 10
Disposals (7) (13)
Reclassified to assets held for sale   (2)
Currency translation effects (3) (2)
Ending Balance 63 62
Equipments [Member] | Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance (44) (44)
Depreciation charge (10) (13)
Disposals 7 9
Reclassified to assets held for sale   2
Currency translation effects 2 2
Ending Balance (45) (44)
Assets under construction [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 7  
Ending Balance 5 7
Assets under construction [member] | Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 7 3
Additions 14 14
Reclassification (15) (13)
Disposals 0 0
Reclassified to assets held for sale   0
Currency translation effects (1) 3
Ending Balance 5 7
Assets under construction [member] | Accumulated depreciation and amortisation [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 0 0
Depreciation charge 0 0
Disposals 0 0
Reclassified to assets held for sale   0
Currency translation effects 0 0
Ending Balance $ 0 $ 0