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Material Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2022
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 | 2-50 years
Wind and Solar generation | 2-30 years
Gas generation | 2-35 years
Energy Transition | 1-10 years
Capital spares and other | 2-50 years
The Company recognized the following asset impairment charges (reversals):
For year ended Dec. 31 |  |  | 2022 | 2021 | 2020
Segments: |  |  |  |  |
Hydro |  |  | 21 |  | 5 |  | 2 |
Wind and Solar |  |  | 43 |  | 12 |  | — |
Gas |  |  | — |  | 5 |  | — |
Energy Transition |  |  | — |  | 540 |  | 82 |
Corporate |  |  | (2) |  | 27 |  | — |
Changes in decommissioning and restoration provisions on retired assets(1) |  |  | (53) |  | 32 |  | — |
Intangible asset impairment charges - coal rights(2) |  |  | — |  | 17 |  | — |
Project development costs(3) |  |  | — |  | 10 |  | — |
Asset impairment charges |  |  | 9 |  | 648 |  | 84 |
(1) Changes relate to changes in discount rates and cash flow revisions on retired assets in 2022 and cash flow revisions on retired assets in 2021. Refer to Note 24 for further details. (2) Impaired to nil in 2021, as no future coal will be extracted from this area of the mine. (3) During 2021, the Company recorded an impairment charge 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. A reconciliation of the changes in the carrying amount of PP&E is as follows:
| Assets under construction | Land | Hydro(1) | Wind and Solar(1) | Gas generation | Energy Transition | Capital spares and other(2) | Total |
Cost |  |  |  |  |  |  |  |  |
As at Dec. 31, 2020 | 495 |  | 96 |  | 846 |  | 2,746 |  | 3,935 |  | 4,901 |  | 379 |  | 13,398 |  |
Additions(3) | 477 |  | — |  | — |  | — |  | — |  | — |  | 2 |  | 479 |  |
Additions from development projects | 1 |  | — |  | — |  | — |  | — |  | — |  | — |  | 1 |  |
Acquisitions (Note 4) | — |  | — |  | — |  | 146 |  | — |  | — |  | — |  | 146 |  |
Disposals | (2) |  | (1) |  | — |  | — |  | (2) |  | (74) |  | — |  | (79) |  |
Impairment charges (Note 7)(4) | (91) |  | — |  | (3) |  | (12) |  | (2) |  | (468) |  | (13) |  | (589) |  |
Revisions/additions to decommissioning and restoration costs (Note 24) | — |  | — |  | 1 |  | 128 |  | 6 |  | — |  | — |  | 135 |  |
Retirement of assets | — |  | — |  | (4) |  | (11) |  | (57) |  | (49) |  | — |  | (121) |  |
Change in foreign exchange rates | — |  | — |  | — |  | 3 |  | (25) |  | 2 |  | (7) |  | (27) |  |
Transfers (to) from assets held for sale (Note 18) | (25) |  | — |  | — |  | — |  | — |  | 31 |  | — |  | 6 |  |
Transfers in (out) of PP&E(5) | 5 |  | — |  | — |  | (4) |  | (5) |  | 46 |  | — |  | 42 |  |
Transfer of assets upon commissioning | (676) |  | 1 |  | 27 |  | 280 |  | 237 |  | 124 |  | 5 |  | (2) |  |
As at Dec. 31, 2021 | 184 |  | 96 |  | 867 |  | 3,276 |  | 4,087 |  | 4,513 |  | 366 |  | 13,389 |  |
Additions (3) | 891 |  | — |  | — |  | — |  | — |  | — |  | 6 |  | 897 |  |
Additions from development projects | 17 |  | — |  | — |  | — |  | — |  | — |  | 12 |  | 29 |  |
Disposals | — |  | (3) |  | — |  | — |  | (1) |  | (216) |  | — |  | (220) |  |
Impairment (charges) reversals (Note 7)(4) | 2 |  | — |  | (21) |  | (43) |  | — |  | — |  | — |  | (62) |  |
Revisions/additions to decommissioning and restoration costs (Note 24) | — |  | — |  | (15) |  | (59) |  | (12) |  | 10 |  | 2 |  | (74) |  |
Retirement of assets | — |  | — |  | (9) |  | (9) |  | (12) |  | (7) |  | (2) |  | (39) |  |
Change in foreign exchange rates | 13 |  | — |  | — |  | 45 |  | (4) |  | 97 |  | 2 |  | 153 |  |
Transfers to assets held for sale (Note 18) | (22) |  | — |  | (9) |  | — |  | — |  | — |  | — |  | (31) |  |
Transfers in (out) of PPE(5) | 16 |  | — |  | — |  | (22) |  | 437 |  | (442) |  | (13) |  | (24) |  |
Transfer of assets upon commissioning | (138) |  | — |  | 27 |  | 45 |  | 35 |  | 19 |  | 6 |  | (6) |  |
As at Dec. 31, 2022 | 963 |  | 93 |  | 840 |  | 3,233 |  | 4,530 |  | 3,974 |  | 379 |  | 14,012 |  |
Accumulated depreciation |  |  |  |  |  |  |  |  |
As at Dec. 31, 2020 | — |  | — |  | 447 |  | 969 |  | 2,058 |  | 3,933 |  | 169 |  | 7,576 |  |
Depreciation | — |  | — |  | 24 |  | 130 |  | 184 |  | 264 |  | 12 |  | 614 |  |
Retirement of assets | — |  | — |  | (3) |  | (6) |  | (55) |  | (48) |  | — |  | (112) |  |
Disposals | — |  | — |  | — |  | — |  | (1) |  | (72) |  | — |  | (73) |  |
Change in foreign exchange rates | — |  | — |  | — |  | — |  | (8) |  | 2 |  | (1) |  | (7) |  |
Transfers to assets held for sale (Note 18) | — |  | — |  | — |  | — |  | — |  | 31 |  | — |  | 31 |  |
Transfers from right-of-use assets | — |  | — |  | — |  | — |  | — |  | 40 |  | — |  | 40 |  |
As at Dec. 31, 2021 | — |  | — |  | 468 |  | 1,093 |  | 2,178 |  | 4,150 |  | 180 |  | 8,069 |  |
Depreciation | — |  | — |  | 21 |  | 130 |  | 308 |  | 63 |  | 16 |  | 538 |  |
Retirement of assets | — |  | — |  | (8) |  | (6) |  | (10) |  | (7) |  | (2) |  | (33) |  |
Disposals | — |  | — |  | — |  | — |  | (1) |  | (211) |  | — |  | (212) |  |
Change in foreign exchange rates | — |  | — |  | — |  | 11 |  | 2 |  | 89 |  | — |  | 102 |  |
Transfers to assets held for sale (Note 18) | — |  | — |  | (3) |  | — |  | — |  | — |  | — |  | (3) |  |
Transfers in (out) of PP&E(5) | — |  | — |  | — |  | — |  | 335 |  | (340) |  | — |  | (5) |  |
As at Dec. 31, 2022 | — |  | — |  | 478 |  | 1,228 |  | 2,812 |  | 3,744 |  | 194 |  | 8,456 |  |
Carrying amount |  |  |  |  |  |  |  |  |
As at Dec. 31, 2020 | 495 |  | 96 |  | 399 |  | 1,777 |  | 1,877 |  | 968 |  | 210 |  | 5,822 |  |
As at Dec. 31, 2021 | 184 |  | 96 |  | 399 |  | 2,183 |  | 1,909 |  | 363 |  | 186 |  | 5,320 |  |
As at Dec. 31, 2022 | 963 |  | 93 |  | 362 |  | 2,005 |  | 1,718 |  | 230 |  | 185 |  | 5,556 |  |
(1) The renewable generation that was previously disclosed has been separated by segment. (2) Includes major spare parts and stand-by equipment available, but not in service, and spare parts used for routine, preventive or planned maintenance. (3) In 2022, the Company capitalized $16 million (2021 – $14 million) of interest to PP&E in at a weighted average rate of 6.0 per cent (2021 – 6.0 per cent). (4) The 2021 impairment charges, net of reversals exclude the changes in decommissioning and restoration provisions on assets. (5) Includes transfers between PP&E classifications, net of accumulated depreciation.
Disclosure of detailed information about intangible assets | Estimated remaining useful lives of intangible assets are as follows:
Software | 1-7 years
Power sale contracts | 1-18 years

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