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Accounts Receivable And Unbilled Revenue - Summary of Movement in unbilled revenue (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Jan. 01, 2023
 [2]
Disclosure of movement in unbilled revenues [abstract]      
Beginning balance $ 309 $ 303  
Unbilled revenue recognized 766 1,011  
Amounts billed (753) (1,004)  
Transfer of EH Cryo project asset (161)    
Currency translation effects (2) (1)  
Ending balance 159 309  
Current unbilled revenue [1] 157 174 $ 138
Non-current unbilled revenue 2 135 $ 165
Total unbilled revenue $ 159 $ 309  
[1] Unbilled revenue was previously titled contract assets. There were no dollar amounts reclassified as a result of the change in name.
[2] Effective January 1, 2024, the Company changed its presentation currency from Canadian dollars to United States dollars. Refer to Note 4 “Changes in Accounting Policies” for further details.