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Credit Facilities, Long-Term Debt, and Finance Lease Obligations - Amounts Outstanding (Details) $ in Millions, $ in Millions | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CAD ($) | Aug. 02, 2018 CAD ($) | Jul. 20, 2018
--- | --- | --- | --- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value |  | $ 3,212 |  | $ 3,267 |  |
Notional amount |  | 3,104 |  | 3,234 |  |
Less: current portion of long-term debt |  | (494) |  | (130) |  |
Less: current portion of finance lease obligations |  | (19) |  | (18) |  |
Total current long-term debt and finance lease obligations |  | (513) |  | (148) |  |
Credit facilities, long-term debt, and finance lease obligations (Note 22) |  | 2,699 |  | 3,119 |  |
All Borrowings Except Finance Lease Obligations [Member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value |  | 3,070 |  | 3,204 |  |
Credit facilities |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value |  | 220 |  | 339 |  |
Notional amount |  | 220 |  | 339 |  |
Debentures |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value |  | 647 |  | 647 | $ 400 |
Notional amount |  | 651 |  | 651 |  |
Interest rate |  |  |  |  | 6.40% | 6.40%
Senior notes |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value |  | 905 |  | 943 |  |
Notional amount |  | 914 |  | 955 |  |
Senior notes | U.S. Dollars |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Notional amount | $ 700 |  | $ 700 |  |  |
Non-recourse |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value |  | 1,144 |  | 1,236 |  |
Notional amount |  | 1,157 |  | 1,250 |  |
Non-recourse | U.S. Dollars |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Notional amount | 1 |  | 1 |  |  |
Other |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value |  | 154 |  | 39 |  |
Notional amount |  | 162 |  | 39 |  |
Other | U.S. Dollars |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Notional amount | $ 117 |  | $ 21 |  |  |
Finance lease obligation |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value |  | $ 142 |  | $ 63 |  |
Weighted average [member] | Credit facilities |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Interest rate | 3.50% | 3.50% | 3.80% | 3.80% |  |
Weighted average [member] | Debentures |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Interest rate | 5.80% | 5.80% | 5.80% | 5.80% |  |
Weighted average [member] | Senior notes |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Interest rate | 5.40% | 5.40% | 5.40% | 5.40% |  |
Weighted average [member] | Non-recourse |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Interest rate | 4.30% | 4.30% | 4.40% | 4.40% |  |
Weighted average [member] | Other |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Interest rate | 7.10% | 7.10% | 9.20% | 9.20% |  |

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