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Property, Plant, and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2021
Disclosure of detailed information about property, plant and equipment [abstract] |
Disclosure of detailed information about property, plant and equipment | Estimated remaining useful lives of the components of depreciable assets, categorized by asset class, are as follows:
Hydro generation | 2-51 years
Wind generation | 2-30 years
Gas generation | 2-36 years
Energy Transition | 2-16 years
Capital spares and other | 2-51 years
| 2021 | 2020 | 2019
PP&E Impairments: |  |  |
Energy Transition facilities and projects (reversals) | 345 |  | 79 |  | (151) |
Energy Transition - Centralia mine decommissioning and restoration provision | — |  | 3 |  | 141 |
Changes in decommissioning and restoration provisions for retired assets(1) | 32 |  | — |  | 2 |
Highvale mine | 195 |  | — |  | — |
Kaybob Cogeneration Project | 27 |  | — |  | — |
Wind | 12 |  | — |  | — |
Hydro | 5 |  | 2 |  | — |
Gas | 5 |  | — |  | — |
Intangible asset impairment - coal rights(2) | 17 |  | — |  | — |
Assets held for sale(3) | — |  | — |  | 15 |
Project development costs(4) | 10 |  | — |  | 18 |
Asset impairment | 648 |  | 84 |  | 25 |
(1) Changes related to changes in discount rates on retired assets. (2) Impaired to nil as no future coal will be extracted from this area of the mine. (3) 2019 amounts relate to trucks and associated inventory to be sold within the Energy Transition segment and accordingly, these items were impaired to net realizable value. (4) During 2021, the Company recorded an impairment of $9 million in the Hydro segment for the balance of project development costs at one of our hydro facilities as there is uncertainty on timing of when the project will proceed and $1 million related to projects that are no longer proceeding. During 2020, the Company wrote off nil (2019 — $18 million) in project development costs related to projects that are no longer proceeding within the Corporate segment. A reconciliation of the changes in the carrying amount of PP&E is as follows:
| Land | Renewable generation | Gas generation(1) | Energy Transition(1) | Assets under construction | Capital spares and other(2) | Total |
Cost |  |  |  |  |  |  |  |
As at Dec. 31, 2019, as previously reported | 91 |  | 3,574 |  | 1,671 |  | 7,342 |  | 228 |  | 489 |  | 13,395 |  |
Adjustments due to re-segmentation | — |  | — |  | 2,402 |  | (2,402) |  | — |  | — |  | — |  |
As at Dec 31, 2019, adjusted | 91 |  | 3,574 |  | 4,073 |  | 4,940 |  | 228 |  | 489 |  | 13,395 |  |
Additions | — |  | — |  | — |  | — |  | 478 |  | 8 |  | 486 |  |
Acquisitions (Note 4) | — |  | — |  | 1 |  | — |  | — |  | — |  | 1 |  |
Disposals | (2) |  | — |  | — |  | (1) |  | — |  | (2) |  | (5) |  |
Impairment (Note 7) | (9) |  | (2) |  | — |  | (69) |  | — |  | (1) |  | (81) |  |
Revisions and additions to decommissioning and restoration costs (Note 23) | — |  | 8 |  | 1 |  | 85 |  | — |  | — |  | 94 |  |
Retirement of assets | — |  | (7) |  | (47) |  | (3) |  | — |  | (1) |  | (58) |  |
Change in foreign exchange rates | (1) |  | (14) |  | 45 |  | (39) |  | — |  | 6 |  | (3) |  |
Transfers | 17 |  | 33 |  | (138) |  | (12) |  | (211) |  | (120) |  | (431) |  |
As at Dec. 31, 2020, adjusted | 96 |  | 3,592 |  | 3,935 |  | 4,901 |  | 495 |  | 379 |  | 13,398 |  |
Additions | — |  | — |  | — |  | — |  | 478 |  | 2 |  | 480 |  |
Acquisitions (Note 4) | — |  | 146 |  | — |  | — |  | — |  | — |  | 146 |  |
Disposals | (1) |  | — |  | (2) |  | (74) |  | (2) |  | — |  | (79) |  |
Impairment (Note 7) | — |  | (15) |  | (2) |  | (468) |  | (91) |  | (13) |  | (589) |  |
Revisions and additions to decommissioning and restoration costs (Note 23) | — |  | 129 |  | 6 |  | — |  | — |  | — |  | 135 |  |
Retirement of assets | — |  | (15) |  | (57) |  | (49) |  | — |  | — |  | (121) |  |
Change in foreign exchange rates | — |  | 3 |  | (25) |  | 2 |  | — |  | (6) |  | (26) |  |
Transfers | 1 |  | 303 |  | 232 |  | 201 |  | (696) |  | 4 |  | 45 |  |
As at Dec. 31, 2021 | 96 |  | 4,143 |  | 4,087 |  | 4,513 |  | 184 |  | 366 |  | 13,389 |  |
Accumulated depreciation |  |  |  |  |  |  |  |
As at Dec. 31, 2019, as previously reported | — |  | 1,284 |  | 900 |  | 4,836 |  | — |  | 168 |  | 7,188 |  |
Adjustments due to re-segmentation | — |  | — |  | 1,137 |  | (1,137) |  | — |  | — |  | — |  |
As at Dec 31, 2019, adjusted | — |  | 1,284 |  | 2,037 |  | 3,699 |  | — |  | 168 |  | 7,188 |  |
Depreciation | — |  | 141 |  | 258 |  | 304 |  | — |  | 14 |  | 717 |  |
Retirement of assets | — |  | (5) |  | (43) |  | (3) |  | — |  | — |  | (51) |  |
Disposals | — |  | — |  | — |  | (1) |  | — |  | (1) |  | (2) |  |
Change in foreign exchange rates | — |  | (4) |  | 18 |  | (37) |  | — |  | 2 |  | (21) |  |
Transfers | — |  | — |  | (212) |  | (29) |  | — |  | (14) |  | (255) |  |
As at Dec. 31, 2020, adjusted | — |  | 1,416 |  | 2,058 |  | 3,933 |  | — |  | 169 |  | 7,576 |  |
Depreciation | — |  | 154 |  | 184 |  | 264 |  | — |  | 12 |  | 614 |  |
Retirement of assets | — |  | (9) |  | (55) |  | (48) |  | — |  | — |  | (112) |  |
Disposals | — |  | — |  | (1) |  | (72) |  | — |  | — |  | (73) |  |
Change in foreign exchange rates | — |  | — |  | (8) |  | 2 |  | — |  | (1) |  | (7) |  |
Transfers | — |  | — |  | — |  | 71 |  | — |  | — |  | 71 |  |
As at Dec. 31, 2021 | — |  | 1,561 |  | 2,178 |  | 4,150 |  | — |  | 180 |  | 8,069 |  |
Carrying amount |  |  |  |  |  |  |  |
As at Dec. 31, 2019, adjusted | 91 |  | 2,290 |  | 2,036 |  | 1,241 |  | 228 |  | 321 |  | 6,207 |  |
As at Dec. 31, 2020, adjusted | 96 |  | 2,176 |  | 1,877 |  | 968 |  | 495 |  | 210 |  | 5,822 |  |
As at Dec. 31, 2021 | 96 |  | 2,582 |  | 1,909 |  | 363 |  | 184 |  | 186 |  | 5,320 |  |
(1) The gas generation and energy transition includes the previously disclosed coal generation and mining property and equipment categories. (2) Includes major spare parts and stand-by equipment available, but not in service and spare parts used for routine, preventive or planned maintenance.

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