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Regulatory Assets and Liabilities - Narrative Assets (Details) CAD in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 CAD | Dec. 31, 2015 CAD | Dec. 31, 2016 USD ($) | Dec. 31, 2016 CAD
Regulatory Assets [Line Items] |  |  |  |
Regulatory asset, amortization period | 1 year |  |  |
Current regulatory assets |  | CAD 246 |  | CAD 313
Regulatory assets |  | 2,532 |  | 2,933
Deferred income taxes (i) |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets not subject to a regulatory return |  | 351 |  | 596
Regulatory assets |  | 936 |  | 1,260
Employee future benefits (ii) |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets not subject to a regulatory return |  | 367 |  | 346
Regulatory assets |  | 627 |  | 576
Rate stabilization accounts (iii) |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets not subject to a regulatory return |  | 44 |  | 139
Current regulatory assets |  | 49 |  | 135
Regulatory assets |  | 119 |  | 183
Rate stabilization accounts (iii) | ITC |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Approved cost-based formula (years) | 1 year |  |  |
Regulatory asset, amortization period | 2 years |  |  |
Regional cost allocation recovery for refunds | $ |  |  | $ 29 |
Deferred energy management costs (iv) |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets not subject to a regulatory return |  | 25 |  | 42
Regulatory assets |  | 145 |  | 178
Deferred energy management costs (iv) | Minimum |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory asset, amortization period | 1 year |  |  |
Deferred energy management costs (iv) | Maximum |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory asset, amortization period | 10 years |  |  |
Deferred lease costs (vi) |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets |  | 90 |  | 97
Deferred lease costs (vi) | FortisBC Electric |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Interest expense related to capital lease obligations | CAD 31 | 30 |  |
Depreciation expense related to assets under capital lease | 6 | 6 |  |
Capital lease costs recognized in energy supply costs and operating expenses | 7 | 7 |  |
Deferred lease costs (vi) | FortisBC Electric | Energy supply costs |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Capital lease costs recognized in energy supply costs and operating expenses | 27 | 26 |  |
Deferred lease costs (vi) | FortisBC Electric | Operating expenses |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Capital lease costs recognized in energy supply costs and operating expenses | CAD 3 | 3 |  |
Natural gas for transportation incentives (viii) |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory asset, amortization period | 10 years |  |  |
Regulatory assets |  | 25 |  | 40
Natural gas for transportation incentives (viii) | FortisBC Energy |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory asset, amortization period | 10 years |  |  |
Derivative instruments (ix) |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets |  | 74 |  | 19
Derivative instruments (ix) | UNS Energy and Central Hudson |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets not subject to a regulatory return |  | 57 |  | 6
Other regulatory assets, individually less than |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets |  |  |  | 40
Approved to be recovered from customers in future rates |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets |  | 265 |  | 296
Other |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets |  | 329 |  | 395
Other regulatory assets not subject to regulatory return |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets not subject to a regulatory return |  | CAD 168 |  | CAD 217

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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