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Property, Plant, and Equipment (Notes) | 12 Months Ended
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Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [abstract] |
Property, Plant, and Equipment | Property, Plant, and Equipment A reconciliation of the changes in the carrying amount of PP&E is as follows:
| Land |  | Coal generation |  | Gas generation |  | Renewable generation |  | Mining property and equipment |  | Assets under construction |  | Capital spares and other(1) |  | Total |
Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
As at Dec. 31, 2015 | 95 |  | 6,091 |  | 1,484 |  | 3,265 |  | 1,208 |  | 351 |  | 360 |  | 12,854 |
Additions | 2 |  | — |  | — |  | 1 |  | — |  | 353 |  | 2 |  | 358 |
Additions - finance lease | — |  | — |  | — |  | — |  | 7 |  | — |  | — |  | 7 |
Disposals | (1 | ) | — |  | (3 | ) | (1 | ) | (1 | ) | — |  | (3 | ) | (9 | )
Impairment charge - Wintering Hills (Note 4) | — |  | — |  | — |  | (28 | ) | — |  | — |  | — |  | (28 | )
Reclassification to held for sale (Note 4) | — |  | — |  | — |  | (67 | ) | — |  | — |  | — |  | (67 | )
Other (Note 6) | — |  | — |  | — |  | — |  | — |  | — |  | (1 | ) | (1 | )
Revisions and additions to decommissioning and restoration costs | — |  | 14 |  | 12 |  | 4 |  | 36 |  | — |  | 5 |  | 71 |
Retirement of assets | — |  | (96 | ) | (3 | ) | (14 | ) | (6 | ) | — |  | (3 | ) | (122 | )
Change in foreign exchange rates | (1 | ) | (38 | ) | (16 | ) | (10 | ) | (3 | ) | (13 | ) | (4 | ) | (85 | )
Transfers(2) | — |  | (95 | ) | 51 |  | 62 |  | 24 |  | (284 | ) | 37 |  | (205 | )
As at Dec. 31, 2016 | 95 |  | 5,876 |  | 1,525 |  | 3,212 |  | 1,265 |  | 407 |  | 393 |  | 12,773 |
Additions | — |  | — |  | — |  | — |  | — |  | 334 |  | 4 |  | 338 |
Additions - finance lease | — |  | — |  | — |  | — |  | 14 |  | — |  | — |  | 14 |
Disposals | — |  | — |  | (16 | ) | (1 | ) | (1 | ) | — |  | (1 | ) | (19 | )
Impairment charge - Sundance Unit 1 (Note 6) | — |  | (20 | ) | — |  | — |  | — |  | — |  | — |  | (20 | )
Revisions and additions to decommissioning and restoration costs | — |  | 82 |  | 12 |  | 15 |  | 42 |  | — |  | — |  | 151 |
Retirement of assets | — |  | (84 | ) | (3 | ) | (4 | ) | (22 | ) | — |  | (6 | ) | (119 | )
Change in foreign exchange rates | (1 | ) | (87 | ) | 3 |  | (23 | ) | (7 | ) | (2 | ) | (2 | ) | (119 | )
Transfers(3) | 1 |  | 121 |  | 461 |  | 29 |  | 24 |  | (644 | ) | (18 | ) | (26 | )
As at Dec. 31, 2017 | 95 |  | 5,888 |  | 1,982 |  | 3,228 |  | 1,315 |  | 95 |  | 370 |  | 12,973 |
Accumulated depreciation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
As at Dec. 31, 2015 | — |  | 3,280 |  | 873 |  | 810 |  | 604 |  | — |  | 114 |  | 5,681 |
Depreciation | — |  | 284 |  | 118 |  | 127 |  | 59 |  | — |  | 19 |  | 607 |
Retirement of assets | — |  | (85 | ) | (4 | ) | (7 | ) | (2 | ) | — |  | (3 | ) | (101 | )
Disposals | — |  | — |  | (1 | ) | — |  | (1 | ) | — |  | — |  | (2 | )
Reclassification to held for sale (Note 4) | — |  | — |  | — |  | (6 | ) | — |  | — |  | — |  | (6 | )
Change in foreign exchange rates | — |  | (28 | ) | (10 | ) | — |  | (1 | ) | — |  | — |  | (39 | )
Transfers | — |  | (239 | ) | 51 |  | (2 | ) | — |  | — |  | (1 | ) | (191 | )
As at Dec. 31, 2016 | — |  | 3,212 |  | 1,027 |  | 922 |  | 659 |  | — |  | 129 |  | 5,949 |
Depreciation | — |  | 351 |  | 67 |  | 123 |  | 76 |  | — |  | 18 |  | 635 |
Retirement of assets | — |  | (62 | ) | (2 | ) | (3 | ) | (18 | ) | — |  | (5 | ) | (90 | )
Disposals | — |  | — |  | (11 | ) | (1 | ) | — |  | — |  | — |  | (12 | )
Change in foreign exchange rates | — |  | (67 | ) | (1 | ) | (4 | ) | (4 | ) | — |  | — |  | (76 | )
Transfers(2) | — |  | (3 | ) | (8 | ) | — |  | — |  | — |  | — |  | (11 | )
As at Dec. 31, 2017 | — |  | 3,431 |  | 1,072 |  | 1,037 |  | 713 |  | — |  | 142 |  | 6,395 |
Carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
As at Dec. 31, 2015 | 95 |  | 2,811 |  | 611 |  | 2,455 |  | 604 |  | 351 |  | 246 |  | 7,173 |
As at Dec. 31, 2016 | 95 |  | 2,664 |  | 498 |  | 2,290 |  | 606 |  | 407 |  | 264 |  | 6,824 |
As at Dec. 31, 2017 | 95 |  | 2,457 |  | 910 |  | 2,191 |  | 602 |  | 95 |  | 228 |  | 6,578 |
(1) Includes major spare parts and stand-by equipment available, but not in service, and spare parts used for routine, preventive, or planned maintenance. (2) Net transfers of $14 million relate to the transfer of gas equipment to finance lease receivables. (3) During the second quarter of 2017, the Corporation reclassified approximately $13 million of capital spares and other assets to inventory. The Corporation capitalized $9 million of interest to PP&E in 2017 (2016 - $16 million) at a weighted average rate of 5.87 per cent (2016 – 5.93 per cent). Finance lease additions in 2017 and 2016 are for mining equipment at the Highvale mine. The carrying amount of total assets under finance leases as at Dec. 31, 2017 was $65 million (2016 - $76 million).

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