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Investments Subject to Significant Influence and Equity Income (Variable Interest Entity) (Details) - CAD CAD in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Consolidated Balance Sheets [Abstract] |  |  |
Assets, Current, Total | CAD 2,511 | CAD 2,596 |
Property, Plant and Equipment, Net | 17,290 | 6,469 |
Other Assets, Noncurrent, Total | 9,420 | 2,974 |
Assets, Total | 29,221 | 12,039 |
Liabilities, Current, Total | 3,724 | 1,367 |
Liabilities, Noncurrent, Total | 18,681 | 6,338 |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Total | 6,816 | 4,334 | CAD 3,705
Liabilities and Equity, Total | 29,221 | 12,039 |
NSPML [Member] |  |  |
Consolidated Balance Sheets [Abstract] |  |  |
Assets, Current, Total | 439 | 439 |
Property, Plant and Equipment, Net | 1,132 | 648 |
Other Assets, Noncurrent, Total | 276 | 554 |
Assets, Total | 1,847 | 1,641 |
Liabilities, Current, Total | 219 | 130 |
Long-term Debt | 1,288 | 1,288 |
Liabilities, Noncurrent, Total | 25 | 35 |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Total | 315 | 188 |
Liabilities and Equity, Total | CAD 1,847 | CAD 1,641 |

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