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Business Acquisitions - Aitken Creek (Details) CAD in Millions, $ in Millions |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 01, 2016 USD ($) | Apr. 01, 2016 CAD | Dec. 31, 2015 USD ($) | Dec. 31, 2015 CAD | Dec. 31, 2016 CAD Bcf | Dec. 31, 2015 CAD | Dec. 31, 2014 CAD
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash purchase price, plus the cost of working gas inventory |  |  |  |  | CAD 4,841 | CAD 38 |
Goodwill (Note 12) |  |  |  | CAD 4,173 | CAD 12,364 | CAD 4,173 | CAD 3,732
Aitken Creek Gas Storage ULC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash purchase price, plus the cost of working gas inventory | $ 266 | CAD 349 |  |  |  |  |
Deposit on acquisition paid |  |  | $ 29 | CAD 38 |  |  |
Goodwill (Note 12) |  | CAD 27 |  |  |  |  |
Aitken Creek | Aitken Creek Gas Storage ULC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Controlling ownership interest (percent) |  |  |  |  | 93.80% |  |
Generating capacity (billion cubic feet) | Bcf |  |  |  |  | 77 |  |
North Aitken Creek | Aitken Creek Gas Storage ULC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Controlling ownership interest (percent) |  |  |  |  | 100.00% |  |

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