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Significant Events - US Wind Projects (Details) $ in Millions, $ in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 28, 2019 CAD ($) | Mar. 28, 2019 USD ($) | Feb. 20, 2018 MW | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2019 USD ($) | Jun. 28, 2018 CAD ($)
Investment [Line Items] |  |  |  |  |  |  |
Notes and debentures issued |  |  |  |  | $ 350 |  |
Issued preferred capital |  |  |  |  |  |  | $ 33
Receivables due from associates |  |  |  |  | 52 | $ 40 |
US Wind Projects - Big Level |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |
Capacity of facility (in megawatts) | MW |  |  | 90 |  |  |  |
Term of power purchase arrangement |  |  | 15 years |  |  |  |
Payments for development project expenditure | $ 7 | $ 5 |  |  |  |  |
Value of equity consideration received |  |  |  | $ 85 |  |  |
US Wind Projects - Antrim |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |
Capacity of facility (in megawatts) | MW |  |  | 29 |  |  |  |
Term of power purchase arrangement |  |  | 20 years |  |  |  |
Consideration paid (received) | 24 |  |  |  |  |  |
Loans and receivables | 41 |  |  |  |  |  |
Investment property under construction or development | 50 |  |  |  |  |  |
Intangible assets under development | $ 15 |  |  |  |  |  |
Value of equity consideration received |  |  |  | 41 |  |  |
US Wind Projects |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |
Notes and debentures issued |  |  |  |  | 142 | 105 |
Issued preferred capital |  |  |  |  | $ 78 | $ 59 |
US Wind Projects | Minimum |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |
Payments for development project expenditure |  |  |  | 250 |  |  |
US Wind Projects | Maximum |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |
Payments for development project expenditure |  |  |  | $ 270 |  |  |

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