Other Liabilities - Schedule of Other Liabilities (Details) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2024
CAD ($)
mine
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Dec. 31, 2021 |
Dec. 31, 2023
CAD ($)
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| Other Commitments [Line Items] | |||
| Employee future benefits (Note 24) | $ 446 | $ 527 | |
| AROs (Note 3) | 249 | 163 | |
| Customer and other deposits | 128 | 168 | |
| Stock-based compensation plans (Note 20) | 113 | 82 | |
| Manufactured gas plant site remediation | 101 | 94 | |
| Derivatives (Note 26) | 66 | 48 | |
| Deferred compensation plan (Note 9) | 63 | 54 | |
| Operating leases (Note 15) | 47 | 39 | |
| Mine reclamation obligations | 40 | 30 | |
| Retail energy contract | 20 | 27 | |
| Other | 41 | 38 | |
| Other liabilities | $ 1,314 | $ 1,270 | |
| TEP | Coal Mine Reclamation | |||
| Other Commitments [Line Items] | |||
| Number of mines | mine | 2 | ||
| Environmental exit costs, estimated reclamation costs | $ 49 | ||
| FortisAlberta | |||
| Other Commitments [Line Items] | |||
| Retail energy contract period | 8 years | ||
| X | ||||||||||
- Definition Contract With Customer, Liability, Agreement Period No definition available.
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| X | ||||||||||
- Definition Number of Mines No definition available.
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| X | ||||||||||
- Definition Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of liability for consideration received or receivable from customer which is not included in transaction price, when consideration is expected to be refunded to customer, classified as noncurrent. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer). No definition available.
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| X | ||||||||||
- Definition Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable after one year (or the operating cycle, if longer). No definition available.
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| X | ||||||||||
- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Total anticipated costs associated with remediation, site restoration, postclosure, monitoring commitments, or other exit costs that may occur on the sale, disposal, or abandonment of a particular property resulting from unanticipated contamination of the assets. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Carrying amount as of the balance sheet date of the liability for remediation, site restoration, postclosure, monitoring commitments, or other exit costs associated with the sale, disposal or abandonment of a particular property resulting from unanticipated contamination of the assets. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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| X | ||||||||||
- Definition Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Obligations not otherwise itemized or categorized in the footnotes to the financial statements that are expected to be paid after one year (or the normal operating cycle, if longer), from the balance sheet date. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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