XML 163 R156.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Dispositions - Walden and Sale of Commercial Real Estate and Hotel Assets (Details) - CAD CAD in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2016 | Feb. 29, 2016 | Oct. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2015
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |
Gain (loss) on sale of non-regulated generation assets, net of expenses |  |  |  |  | CAD 0 | CAD 56
Proceeds on sale of assets |  |  |  |  | 50 | 922
Gain (loss) on sale of commercial real estate and hotel assets, net of expense and tax |  |  |  |  | CAD 0 | 109
Fortis Properties, Commercial Real Estate Assets |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |
Proceeds on sale of assets |  |  |  | CAD 430 |  |
Net gain (loss) on sale of commercial real estate and hotel assets |  |  |  | 129 |  |
Gain (loss) on sale of commercial real estate and hotel assets, net of expense and tax |  |  |  | 109 |  |
Trust units subscribed of Slate Office REIT |  |  |  | CAD 35 |  |
Gross proceeds from sale of investment of Slate Office REIT | CAD 37 |  |  |  |  |
Fortis Properties, Hotel Assets |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |
Proceeds on sale of assets |  |  | CAD 365 |  |  |
Net gain (loss) on sale of commercial real estate and hotel assets |  |  | (20) |  |  |
Gain (loss) on sale of commercial real estate and hotel assets, net of expense and tax |  |  | CAD (8) |  |  |
Fortis Properties |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |
Earnings before taxes related to disposal, excluding gain of sale |  |  |  |  |  | CAD 18
FortisBC Electric | Walden Hydroelectric Power Plant Assets |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |
Proceeds from sale of assets |  | CAD 9 |  |  |  |
Gain (loss) on sale of non-regulated generation assets, net of expense and tax |  | CAD 1 |  |  |  |

X
- Definition Gain (Loss) on Disposition of Property Plant and Equipment, Net of Expense + References No definition available. + Details
Name: | fts_GainLossonDispositionofPropertyPlantandEquipmentNetofExpense
Namespace Prefix: | fts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Gain (Loss) on Disposition of Property Plant and Equipment, Net of Expense and Tax + References No definition available. + Details
Name: | fts_GainLossonDispositionofPropertyPlantandEquipmentNetofExpenseandTax
Namespace Prefix: | fts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Gain (Loss) on Sale of Properties, Net of Expense + References No definition available. + Details
Name: | fts_GainLossonSaleofPropertiesNetofExpense
Namespace Prefix: | fts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Gain (Loss) on Sale of Properties, Net of Expense and Tax + References No definition available. + Details
Name: | fts_GainLossonSaleofPropertiesNetofExpenseandTax
Namespace Prefix: | fts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Income (Loss) before Tax, related to disposals, excluding Net Gain on Sale + References No definition available. + Details
Name: | fts_IncomeLossbeforeTaxrelatedtodisposalsexcludingNetGainonSale
Namespace Prefix: | fts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Trust Units, Units Subscribed + References No definition available. + Details
Name: | fts_TrustUnitsUnitsSubscribed
Namespace Prefix: | fts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total amount of proceeds received for the sale of securities, categorized neither as held-to-maturity nor trading securities, during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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_LongLivedAssetsHeldForSaleLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
Name: | us-gaap_ProceedsFromSaleOfProductiveAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
Name: | us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis=fts_FortisPropertiesCommercialRealEstateAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis=fts_FortisPropertiesHotelAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis=fts_FortisPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=fts_FortisBCInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis=fts_WaldenHydroelectricPowerPlantAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |