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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2024
Asset Retirement Obligations [Abstract] |
Change in Asset Retirement Obligations | The change in ARO for the years ended December 31 is as follows: millions of dollars 2024 2023 Balance, January 1 $ 192 $ 174 Additions 11 - Accretion included in depreciation expense 10 9 Change in FX rate 5 (1) Revisions in estimated cash flows 2 - Accretion deferred to regulatory asset (included in PP&E) - 18 Classified as assets held for sale (1) (1) - Liabilities settled (2) (8) Balance, December 31 $ 217 $ 192 (1) As at December 31, 2024, NMGC's assets and liabilities were classified as held for sale. For further details on the pending transaction, refer to note 4.

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- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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