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Material Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2021
Disclosure of changes in accounting policies, accounting estimates and errors [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
202120202019
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 mine195 — — 
Kaybob Cogeneration Project27 — — 
Wind12 — — 
Hydro5 2 — 
Gas5 — — 
Intangible asset impairment - coal rights(2)
17 — — 
Assets held for sale(3)
— — 15 
Project development costs(4)
10 — 18 
Asset impairment648 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:
 LandRenewable
generation
Gas generation(1)
Energy Transition(1)
Assets under
construction
Capital spares
and other(2)
Total
Cost       
As at Dec. 31, 2019, as previously reported91 3,574 1,671 7,342 228 489 13,395 
Adjustments due to re-segmentation— — 2,402 (2,402)— — — 
As at Dec 31, 2019, adjusted91 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)
Transfers17 33 (138)(12)(211)(120)(431)
As at Dec. 31, 2020, adjusted96 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)
Transfers1 303 232 201 (696)4 45 
As at Dec. 31, 202196 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, adjusted91 2,290 2,036 1,241 228 321 6,207 
As at Dec. 31, 2020, adjusted96 2,176 1,877 968 495 210 5,822 
As at Dec. 31, 202196 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.
Disclosure of detailed information about intangible assets Estimated remaining useful lives of intangible assets are as follows:
Software
2-7 years
Power sale contracts
1-19 years