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Credit Facilities, Long-Term Debt, and Finance Lease Obligations - Senior Notes (Details) $ in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2016 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Notional amount | $ 3,234 |  |  | $ 3,664 |
Borrowings | $ 3,267 |  |  | $ 3,707 |
Senior notes | Minimum |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Interest rate |  |  |  | 4.50% |
Senior notes | Maximum |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Interest rate |  |  |  | 6.50% |
6.65% Senior notes, due May 2018 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Interest rate | 6.65% |  | 6.65% |  |
Borrowings | $ 500 |  | $ 500 |  |
Redemption of noncurrent borrowings | 617 | $ 516 |  |  |
Redemption of prepayment premium recognized in net interest expense | 5 |  |  |  |
Accrued and unpaid interest | $ 14 |  |  |  |
4.75% Senior Notes due 2015 | Designated as hedging instrument |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Notional amount |  |  |  |  | $ 480
4.75% Senior Notes due 2015 | Senior notes |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Interest rate | 1.90% |  | 1.90% |  |
Notional amount |  |  | $ 400 |  |
Borrowings | $ 434 |  |  |  |
Non-Recourse Bonds |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Interest rate | 4.509% |  | 4.509% |  |

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