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Credit Facilities, Long-Term Debt, and Finance Lease Obligations - Amounts Outstanding (Details) $ in Millions, $ in Millions | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($) | Aug. 02, 2018 CAD ($) | Jul. 20, 2018 | Dec. 31, 2017 CAD ($) | Dec. 31, 2017 USD ($)
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Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value | $ 3,267 |  |  |  | $ 3,707 |
Notional amount | 3,234 |  |  |  | 3,664 |
Less: current portion of long-term debt | (130) |  |  |  | (729) |
Less: current portion of finance lease obligations | (18) |  |  |  | (18) |
Total current long-term debt and finance lease obligations | (148) |  |  |  | (747) |
Credit facilities, long-term debt, and finance lease obligations (Note 22) | 3,119 |  |  |  | 2,960 |
All Borrowings Except Finance Lease Obligations [Member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value | 3,204 |  |  |  | 3,638 |
Credit facilities |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value | 339 |  |  |  | 27 |
Notional amount | 339 |  |  |  | 27 |
Debentures |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value | 647 |  | $ 400 |  | 1,046 |
Notional amount | 651 |  |  |  | 1,051 |
Interest rate |  |  | 6.40% | 6.40% |  |
Senior notes |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value | 943 |  |  |  | 1,499 |
Notional amount | 955 |  |  |  | 1,510 |
Senior notes | U.S. Dollars |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Notional amount |  | $ 700 |  |  |  | $ 1,200
Non-recourse |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value | 1,236 |  |  |  | 1,022 |
Notional amount | 1,250 |  |  |  | 1,032 |
Non-recourse | U.S. Dollars |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Notional amount |  | 1 |  |  |  | 27
Other |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value | 39 |  |  |  | 44 |
Notional amount | 39 |  |  |  | 44 |
Other | U.S. Dollars |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Notional amount |  | $ 21 |  |  |  | $ 24
Finance lease obligation |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Carrying value | $ 63 |  |  |  | $ 69 |
Weighted average [member] | Credit facilities |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Interest rate | 3.80% | 3.80% |  |  | 2.80% | 2.80%
Weighted average [member] | Debentures |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Interest rate | 5.80% | 5.80% |  |  | 6.00% | 6.00%
Weighted average [member] | Senior notes |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Interest rate | 5.40% | 5.40% |  |  | 6.00% | 6.00%
Weighted average [member] | Non-recourse |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Interest rate | 4.40% | 4.40% |  |  | 4.30% | 4.30%
Weighted average [member] | Other |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Interest rate | 9.20% | 9.20% |  |  | 9.20% | 9.20%

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