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Regulatory Assets and Liabilities - Narrative Liabilities (Details) CAD in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2015 | Dec. 31, 2013 complaint | Dec. 31, 2016 USD ($) | Dec. 31, 2016 CAD | Dec. 31, 2015 CAD
Regulatory Liabilities [Line Items] |  |  |  |  |
Current regulatory liabilities |  |  |  | CAD 492 | CAD 298
Regulatory liability |  |  |  | 2,183 | 1,638
Employee future benefits (ii) |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Regulatory liability |  |  |  | 42 | 44
Regulatory liabilities not subject to regulatory return |  |  |  | 31 | 36
Rate stabilization accounts (iii) |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Current regulatory liabilities |  |  |  | 173 | 142
Regulatory liability |  |  |  | 230 | 212
Regulatory liabilities not subject to regulatory return |  |  |  | 180 | 123
ROE refund liability (xii) |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Regulatory liability |  |  |  | 346 | 0
ROE refund liability (xii) | ITC |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Complaints (number) | complaint |  | 2 |  |  |
Regulatory liability | $ |  |  | $ 258 |  |
ROE refund liability (xii) | ITC | Minimum |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Regulatory liability | $ |  |  | 221 |  |
ROE refund liability (xii) | ITC | Maximum |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Regulatory liability | $ |  |  | 258 |  |
ROE refund liability, initial complaint | ITC | Current regulatory liabilities |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Regulatory liability | $ |  |  | $ 119 |  |
Electric and gas moderator account (xiii) |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Regulatory liability |  |  |  | 71 | 88
Electric and gas moderator account (xiii) | Central Hudson |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Approved rate (period) | 3 years |  |  |  |
Renewable energy surcharge (xiv) |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Regulatory liability |  |  |  | CAD 53 | 47
Renewable energy surcharge (xiv) | UNS Energy |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Renewable energy target (at least) (percent) |  |  | 15.00% | 15.00% |
Distributed generation Requirement Percentage of Target Percentage (percent) |  |  | 30.00% | 30.00% |
Other regulatory liabilities individually less than |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Regulatory liability |  |  |  | CAD 40 |
Approved refund to customers or reduction in future rates |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Regulatory liability |  |  |  | 190 | 156
Other |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |
Regulatory liability |  |  |  | 198 | 167
Regulatory liabilities not subject to regulatory return |  |  |  | CAD 51 | CAD 80

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