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Investments - Narrative (Details) $ in Millions, $ in Millions |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 30, 2020 USD ($) | Nov. 25, 2020 CAD ($) MW | Nov. 25, 2020 USD ($) MW | Dec. 31, 2020 CAD ($) | Dec. 31, 2021 CAD ($) | May 25, 2021 | May 26, 2020
Investment [Line Items] |  |  |  |  |  |  |
Percentage of public float of common shares making up stock purchase agreement, shares authorized |  |  |  |  |  | 7.16% | 7.02%
Finance lease receivables |  |  |  | $ (264) | $ (225) |  |
BHP Billiton Nickel West Pty Ltd. | Southern Cross Energy |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |
Gain (loss) of derecognised financial assets at date of transfer |  |  |  | 77 |  |  |
Finance lease receivables |  |  |  | (89) |  |  |
Gains (losses) on disposals of non-current assets |  |  |  | $ (12) |  |  |
EMG International, LLC |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |
Other cash payments to acquire interests in joint ventures, classified as investing activities | $ 12 |  |  |  |  |  |
Proportion of ownership interest in subsidiary | 30.00% |  |  |  |  |  |
Skookumchuck |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |
Other cash payments to acquire interests in joint ventures, classified as investing activities |  | $ 86 | $ 66 |  |  |  |
Capacity of facility (in megawatts) | MW |  | 136.8 | 136.8 |  |  |  |
Proportion of ownership interest in subsidiary |  | 49.00% | 49.00% |  |  |  |

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