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Property, Plant, and Equipment - Reconciliation of the changes in the carrying amount of PP&E (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment, beginning of the period | $ 6,164 | $ 6,578
Property, plant and equipment, end of the period | 6,207 | 6,164
Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment, beginning of the period | 13,202 | 12,973
Additions other than through business combinations, property, plant and equipment | 522 | 284
Acquisitions | 439 |
Disposals | (704) | (7)
Retirement of assets | (201) | (90)
Change in foreign exchange rates | (134) | 131
Transfers | (29) | (18)
Property, plant and equipment, end of the period | 13,395 | 13,202
Gross carrying amount | Increase (Decrease) Due To Application of IFRS 16 [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Increase (decrease) in property, plant and equipment | (108) |
Accumulated depreciation |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment, beginning of the period | (7,038) | (6,395)
Disposals | (439) | (5)
Impairment reversals | (297) |
Retirement of assets | (190) | (83)
Change in foreign exchange rates | (76) | 92
Transfers | (26) | (10)
Depreciation | (630) | (649)
Property, plant and equipment, end of the period | (7,188) | (7,038)
Accumulated depreciation | Increase (Decrease) Due To Application of IFRS 16 [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Increase (decrease) in property, plant and equipment | (46) |
Land |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment, beginning of the period | 94 | 95
Property, plant and equipment, end of the period | 91 | 94
Land | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment, beginning of the period | 94 | 95
Additions other than through business combinations, property, plant and equipment | 0 | 0
Acquisitions | 0 |
Disposals | (2) | (3)
Retirement of assets | 0 | 0
Change in foreign exchange rates | (1) | 2
Transfers | 0 | 0
Property, plant and equipment, end of the period | 91 | 94
Land | Gross carrying amount | Increase (Decrease) Due To Application of IFRS 16 [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Increase (decrease) in property, plant and equipment | 0 |
Land | Accumulated depreciation |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment, beginning of the period | 0 | 0
Disposals | 0 | 0
Impairment reversals | 0 |
Retirement of assets | 0 | 0
Change in foreign exchange rates | 0 | 0
Transfers | 0 | 0
Depreciation | 0 | 0
Property, plant and equipment, end of the period | 0 | 0
Land | Accumulated depreciation | Increase (Decrease) Due To Application of IFRS 16 [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Increase (decrease) in property, plant and equipment | 0 |
Coal generation |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment, beginning of the period | 2,172 | 2,457
Property, plant and equipment, end of the period | 2,120 | 2,172
Coal generation | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment, beginning of the period | 5,937 | 5,888
Additions other than through business combinations, property, plant and equipment | 0 | 0
Acquisitions | 300 |
Disposals | (389) | 0
Retirement of assets | (158) | (47)
Change in foreign exchange rates | (63) | 105
Transfers | 103 | 41
Property, plant and equipment, end of the period | 6,116 | 5,937
Coal generation | Gross carrying amount | Increase (Decrease) Due To Application of IFRS 16 [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Increase (decrease) in property, plant and equipment | 0 |
Coal generation | Accumulated depreciation |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment, beginning of the period | (3,765) | (3,431)
Disposals | (170) | 0
Impairment reversals | (297) |
Retirement of assets | (158) | (56)
Change in foreign exchange rates | (52) | 84
Transfers | 10 | 0
Depreciation | (304) | (306)
Property, plant and equipment, end of the period | (3,996) | (3,765)
Coal generation | Accumulated depreciation | Increase (Decrease) Due To Application of IFRS 16 [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Increase (decrease) in property, plant and equipment | 0 |
Gas generation |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment, beginning of the period | 836 | 910
Property, plant and equipment, end of the period | 771 | 836
Gas generation | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment, beginning of the period | 1,964 | 1,982
Additions other than through business combinations, property, plant and equipment | 0 | 0
Acquisitions | 0 |
Disposals | (260) | 0
Retirement of assets | (26) | (17)
Change in foreign exchange rates | (40) | (13)
Transfers | 22 | 13
Property, plant and equipment, end of the period | 1,671 | 1,964
Gas generation | Gross carrying amount | Increase (Decrease) Due To Application of IFRS 16 [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Increase (decrease) in property, plant and equipment | 0 |
Gas generation | Accumulated depreciation |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment, beginning of the period | (1,128) | (1,072)
Disposals | (255) | 0
Impairment reversals | 0 |
Retirement of assets | (23) | (13)
Change in foreign exchange rates | (16) | (3)
Transfers | (11) | (7)
Depreciation | (77) | (79)
Property, plant and equipment, end of the period | (900) | (1,128)
Gas generation | Accumulated depreciation | Increase (Decrease) Due To Application of IFRS 16 [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Increase (decrease) in property, plant and equipment | 0 |
Renewable generation |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment, beginning of the period | 2,125 | 2,191
Property, plant and equipment, end of the period | 2,290 | 2,125
Renewable generation | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment, beginning of the period | 3,286 | 3,228
Additions other than through business combinations, property, plant and equipment | 0 | 1
Acquisitions | 0 |
Disposals | 0 | 0
Retirement of assets | (7) | (6)
Change in foreign exchange rates | (17) | 26
Transfers | 319 | 51
Property, plant and equipment, end of the period | 3,574 | 3,286
Renewable generation | Gross carrying amount | Increase (Decrease) Due To Application of IFRS 16 [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Increase (decrease) in property, plant and equipment | (7) |
Renewable generation | Accumulated depreciation |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment, beginning of the period | (1,161) | (1,037)
Disposals | 0 | 0
Impairment reversals | 0 |
Retirement of assets | (3) | (2)
Change in foreign exchange rates | (4) | 6
Transfers | (3) | (3)
Depreciation | (136) | (123)
Property, plant and equipment, end of the period | (1,284) | (1,161)
Renewable generation | Accumulated depreciation | Increase (Decrease) Due To Application of IFRS 16 [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Increase (decrease) in property, plant and equipment | (3) |
Mining property and equipment |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment, beginning of the period | 508 | 602
Property, plant and equipment, end of the period | 386 | 508
Mining property and equipment | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment, beginning of the period | 1,338 | 1,315
Additions other than through business combinations, property, plant and equipment | 0 | 0
Acquisitions | 0 |
Disposals | (34) | (1)
Retirement of assets | (10) | (16)
Change in foreign exchange rates | (3) | 7
Transfers | 25 | 39
Property, plant and equipment, end of the period | 1,226 | 1,338
Mining property and equipment | Gross carrying amount | Increase (Decrease) Due To Application of IFRS 16 [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Increase (decrease) in property, plant and equipment | (101) |
Mining property and equipment | Accumulated depreciation |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment, beginning of the period | (830) | (713)
Disposals | (14) | (1)
Impairment reversals | 0 |
Retirement of assets | (6) | (12)
Change in foreign exchange rates | (2) | 5
Transfers | (22) | 0
Depreciation | (97) | (125)
Property, plant and equipment, end of the period | (840) | (830)
Mining property and equipment | Accumulated depreciation | Increase (Decrease) Due To Application of IFRS 16 [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Increase (decrease) in property, plant and equipment | (43) |
Assets under construction |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment, beginning of the period | 200 | 95
Property, plant and equipment, end of the period | 228 | 200
Assets under construction | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment, beginning of the period | 200 | 95
Additions other than through business combinations, property, plant and equipment | 407 | 275
Acquisitions | 139 |
Disposals | 0 | 0
Retirement of assets | 0 | 0
Change in foreign exchange rates | (4) | 4
Transfers | (514) | (174)
Property, plant and equipment, end of the period | 228 | 200
Assets under construction | Gross carrying amount | Increase (Decrease) Due To Application of IFRS 16 [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Increase (decrease) in property, plant and equipment | 0 |
Assets under construction | Accumulated depreciation |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment, beginning of the period | 0 | 0
Disposals | 0 | 0
Impairment reversals | 0 |
Retirement of assets | 0 | 0
Change in foreign exchange rates | 0 | 0
Transfers | 0 | 0
Depreciation | 0 | 0
Property, plant and equipment, end of the period | 0 | 0
Assets under construction | Accumulated depreciation | Increase (Decrease) Due To Application of IFRS 16 [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Increase (decrease) in property, plant and equipment | 0 |
Capital spares and other |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment, beginning of the period | 229 | 228
Property, plant and equipment, end of the period | 321 | 229
Capital spares and other | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment, beginning of the period | 383 | 370
Additions other than through business combinations, property, plant and equipment | 115 | 8
Acquisitions | 0 |
Disposals | (19) | (3)
Retirement of assets | 0 | (4)
Change in foreign exchange rates | (6) | 0
Transfers | 16 | 12
Property, plant and equipment, end of the period | 489 | 383
Capital spares and other | Gross carrying amount | Increase (Decrease) Due To Application of IFRS 16 [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Increase (decrease) in property, plant and equipment | 0 |
Capital spares and other | Accumulated depreciation |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Property, plant and equipment, beginning of the period | (154) | (142)
Disposals | 0 | (4)
Impairment reversals | 0 |
Retirement of assets | 0 | 0
Change in foreign exchange rates | (2) | 0
Transfers | 0 | 0
Depreciation | (16) | (16)
Property, plant and equipment, end of the period | (168) | (154)
Capital spares and other | Accumulated depreciation | Increase (Decrease) Due To Application of IFRS 16 [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Increase (decrease) in property, plant and equipment | 0 |
Decommissioning and restoration | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Revisions and additions to decommissioning and restoration costs | (23) | (32)
Decommissioning and restoration | Land | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Revisions and additions to decommissioning and restoration costs | 0 | 0
Decommissioning and restoration | Coal generation | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Revisions and additions to decommissioning and restoration costs | (62) | (12)
Decommissioning and restoration | Gas generation | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Revisions and additions to decommissioning and restoration costs | 11 | (1)
Decommissioning and restoration | Renewable generation | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Revisions and additions to decommissioning and restoration costs | 2 | (3)
Decommissioning and restoration | Mining property and equipment | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Revisions and additions to decommissioning and restoration costs | 26 | (16)
Decommissioning and restoration | Assets under construction | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Revisions and additions to decommissioning and restoration costs | 0 | 0
Decommissioning and restoration | Capital spares and other | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Revisions and additions to decommissioning and restoration costs | 0 | 0
Poplar Creek | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Impairment charges |  | (49)
Poplar Creek | Land | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Impairment charges |  | 0
Poplar Creek | Coal generation | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Impairment charges |  | (38)
Poplar Creek | Gas generation | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Impairment charges |  | 0
Poplar Creek | Renewable generation | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Impairment charges |  | (11)
Poplar Creek | Mining property and equipment | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Impairment charges |  | 0
Poplar Creek | Assets under construction | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Impairment charges |  | 0
Poplar Creek | Capital spares and other | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Impairment charges |  | 0
Wintering Hills | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Impairment charges | 431 |
Wintering Hills | Land | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Impairment charges | 0 |
Wintering Hills | Coal generation | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Impairment charges | 448 |
Wintering Hills | Gas generation | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Impairment charges | 0 |
Wintering Hills | Renewable generation | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Impairment charges | (2) |
Wintering Hills | Mining property and equipment | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Impairment charges | (15) |
Wintering Hills | Assets under construction | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Impairment charges | 0 |
Wintering Hills | Capital spares and other | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Impairment charges | $ 0 |
Finance lease receivables | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Additions other than through business combinations, property, plant and equipment |  | 10
Finance lease receivables | Land | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Additions other than through business combinations, property, plant and equipment |  | 0
Finance lease receivables | Coal generation | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Additions other than through business combinations, property, plant and equipment |  | 0
Finance lease receivables | Gas generation | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Additions other than through business combinations, property, plant and equipment |  | 0
Finance lease receivables | Renewable generation | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Additions other than through business combinations, property, plant and equipment |  | 0
Finance lease receivables | Mining property and equipment | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Additions other than through business combinations, property, plant and equipment |  | 10
Finance lease receivables | Assets under construction | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Additions other than through business combinations, property, plant and equipment |  | 0
Finance lease receivables | Capital spares and other | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Additions other than through business combinations, property, plant and equipment |  | 0
US Wind Projects - Big Level | Assets under construction | Gross carrying amount |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Additions other than through business combinations, property, plant and equipment |  | $ 7

X
- Definition The increase in property, plant and equipment resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 73 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e_iii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e_i&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e_vii&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_75_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The decrease in property, plant and equipment resulting from disposals. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 73 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 73 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e_v&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_98_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in property, plant and equipment 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: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 73 -Subparagraph e -Clause viii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e_viii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 73 -Subparagraph e -Clause ix -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e_ix&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from transfers. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e&doctype=Standard -URIDate 2018-03-16 + Details
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