XML 105 R85.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Property, Plant And Equipment - Schedule of Jointly-Owned Utility Plants (Details) $ in Millions | Dec. 31, 2024 CAD ($)
--- | ---
Jointly Owned Facilities [Line Items] |
Cost | $ 3,126
Accumulated Depreciation | (1,191)
Net Book Value | 1,935
Transmission Facilities |
Jointly Owned Facilities [Line Items] |
Cost | 1,704
Accumulated Depreciation | (489)
Net Book Value | $ 1,215
Springerville Common Facilities |
Jointly Owned Facilities [Line Items] |
Ownership (percent) | 86.00%
Cost | $ 580
Accumulated Depreciation | (344)
Net Book Value | $ 236
Springerville Coal Handling Facilities |
Jointly Owned Facilities [Line Items] |
Ownership (percent) | 83.00%
Cost | $ 299
Accumulated Depreciation | (154)
Net Book Value | $ 145
Four Corners Units 4 and 5 ("Four Corners") |
Jointly Owned Facilities [Line Items] |
Ownership (percent) | 7.00%
Cost | $ 311
Accumulated Depreciation | (155)
Net Book Value | $ 156
Gila River Common Facilities |
Jointly Owned Facilities [Line Items] |
Ownership (percent) | 50.00%
Cost | $ 131
Accumulated Depreciation | (52)
Net Book Value | $ 79
Luna Energy Facility ("Luna") |
Jointly Owned Facilities [Line Items] |
Ownership (percent) | 33.30%
Cost | $ 101
Net Book Value | 104
Luna Energy Facility ("Luna") | Adjustment |
Jointly Owned Facilities [Line Items] |
Accumulated Depreciation | $ 3

X
- Definition The period end amount owned by the reporting utility of a jointly owned utility plant in service. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479070/980-360-S99-1 + Details
Name: | us-gaap_JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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. + References No definition available. + Details
Name: | us-gaap_JointlyOwnedUtilityPlantInterestsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total period end amount of plant in service and construction in progress net of accumulated depreciation for the utility's share of jointly owned electricity generation plant. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479070/980-360-S99-1 + Details
Name: | us-gaap_JointlyOwnedUtilityPlantNetOwnershipAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The period end amount of accumulated depreciation in a jointly owned electricity generation plant. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479070/980-360-S99-1 + Details
Name: | us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The proportionate share of interest (percent) in a jointly owned utility plant. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479070/980-360-S99-1 + Details
Name: | us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=us-gaap_JointlyOwnedElectricityTransmissionAndDistributionSystemMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=fts_SpringervilleCommonFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=fts_JointlyOwnedElectricityGenerationPlantSpringervilleCoalHandlingFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=fts_JointlyOwnedElectricityGenerationPlantFourCornersUnits4and5Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=fts_JointlyOwnedElectricityGenerationPlantGilaRiverCommonFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=fts_JointlyOwnedElectricityGenerationPlantLunaEnergyFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | fts_NettingAxis=fts_NettingAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |