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Other Liabilities - Schedule of Other Liabilities (Details) - CAD CAD in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Other Liabilities Disclosure [Abstract] |  |
OPEB plan liabilities (Note 26) | CAD 411 | CAD 385
Defined benefit pension plan liabilities (Note 26) | 410 | 368
MGP site remediation (Notes 8 (v) and 13) | 77 | 96
Customer and other deposits | 69 | 38
Debt Instrument [Line Items] |  |
Asset retirement obligations | 58 | 49
Mine reclamation and retiree health care liabilities | 40 | 39
Deferred compensation plan liabilities (Note 9) | 27 | 25
DSU, PSU and RSU liabilities (Note 22) | 24 | 20
Fair value of derivative instruments (Note 30) | 10 | 13
Other | 94 | 63
Other liabilities | 1,279 | 1,152
Waneta Partnership | Waneta Partnership promissory note |  |
Debt Instrument [Line Items] |  |
Waneta Partnership promissory note (Notes 30, 31 and 33) | CAD 59 | CAD 56

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