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Intangible Assets (Details) - CAD CAD in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | CAD 355 | CAD 369
Ending balance | 364 | 355
Gross carrying amount |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 693 | 672
Additions | 51 | 21
Additions - capital lease |  | 3
Retirements |  | (3)
Change in foreign exchange rates | (3) | (2)
Transfers | (3) | (2)
Ending balance | 744 | 693
Accumulated amortization |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 338 | 303
Retirements | 1 |
Change in foreign exchange rates |  | (3)
Transfers | 0 |
Amortization | 41 | 38
Ending balance | 380 | 338
Coal rights |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 63 | 69
Ending balance | 53 | 63
Coal rights | Gross carrying amount |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 178 | 178
Additions | 0 | 0
Additions - capital lease |  | 0
Retirements |  | 0
Change in foreign exchange rates | 0 | 0
Transfers | 0 | 0
Ending balance | 178 | 178
Coal rights | Accumulated amortization |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 115 | 109
Retirements | 0 |
Change in foreign exchange rates |  | 0
Transfers | 2 |
Amortization | 8 | 6
Ending balance | 125 | 115
Software and other |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 105 | 114
Ending balance | 126 | 105
Software and other | Gross carrying amount |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 268 | 256
Additions | 31 | 0
Additions - capital lease |  | 3
Retirements |  | (3)
Change in foreign exchange rates | (3) | (1)
Transfers | (18) | (13)
Ending balance | 314 | 268
Software and other | Accumulated amortization |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 163 | 142
Retirements | 1 |
Change in foreign exchange rates |  | (3)
Transfers | 0 |
Amortization | 24 | 24
Ending balance | 188 | 163
Power sale contracts |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 163 | 171
Ending balance | 156 | 163
Power sale contracts | Gross carrying amount |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 223 | 223
Additions | 0 | 0
Additions - capital lease |  | 0
Retirements |  | 0
Change in foreign exchange rates | 0 | 0
Transfers | 0 | 0
Ending balance | 223 | 223
Power sale contracts | Accumulated amortization |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 60 | 52
Retirements | 0 |
Change in foreign exchange rates |  | 0
Transfers | (2) |
Amortization | 9 | 8
Ending balance | 67 | 60
Intangibles under development |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 24 | 15
Ending balance | 29 | 24
Intangibles under development | Gross carrying amount |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 24 | 15
Additions | 20 | 21
Additions - capital lease |  | 0
Retirements |  | 0
Change in foreign exchange rates | 0 | (1)
Transfers | 15 | 11
Ending balance | 29 | 24
Intangibles under development | Accumulated amortization |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 0 | 0
Retirements | 0 |
Change in foreign exchange rates |  | 0
Transfers | 0 |
Amortization | 0 | 0
Ending balance | CAD 0 | CAD 0

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- Definition The increase in intangible assets other than goodwill resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of additions to intangible assets other than goodwill, other than those acquired through business combinations. [Refer: Business combinations [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in intangible assets other than goodwill resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e_vii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in intangible assets other than goodwill resulting from transfers. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of identifiable non-monetary assets without physical substance. This amount does not include goodwill. [Refer: Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_c&doctype=Standard -URIDate 2017-03-09 + Details
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