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Guarantees, Commitments, and Contingencies - Additional Information (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Jan. 01, 2023
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Disclosure of Companys purchase obligations of future period [Line Items] |  |  |
EH Cryo project asset | $ 161 |  |
Secured Revolving Credit Facility [Member] |  |  |
Disclosure of Companys purchase obligations of future period [Line Items] |  |  |
Letters of credit, outstanding | 116 | $ 140 | $ 129
Secured Revolving Credit Facility [Member] | Performance Guaranteed By Export Development Canada [Member] |  |  |
Disclosure of Companys purchase obligations of future period [Line Items] |  |  |
Letters of credit, outstanding |  |  | 0
Debt Instrument Current Borrowing Capacity | 70 |  |
Secured Revolving Credit Facility [Member] | Performance Guaranteed By Export Development Canada [Member] | Letter Of Credit Facility [Member] |  |  |
Disclosure of Companys purchase obligations of future period [Line Items] |  |  |
Letters of credit, outstanding | 29 | 36 |
Debt Instrument Current Borrowing Capacity | 70 |  |
Secured Revolving Credit Facility [Member] | Performance Guaranteed By Export Development Canada [Member] | Revolving Credit Facility [Member] |  |  |
Disclosure of Companys purchase obligations of future period [Line Items] |  |  |
Letters of credit, outstanding | $ 87 | $ 104 | $ 129

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