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financial instruments - Fair Values Derivatives (Details) |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2017 CAD ($) | Dec. 31, 2018 CAD ($) $ / $ | Dec. 31, 2017 CAD ($) $ / $
Disclosure of detailed information about financial instruments |  |  |
Current Assets, Fair value and carrying value | $ 11,000,000 | $ 49,000,000 | $ 18,000,000
Current Liabilities, Fair value and carrying value | 12,000,000 | 9,000,000 | 33,000,000
Other Long-Term Liabilities, Fair value and carrying value |  | $ 6,000,000 | $ 76,000,000
Derivatives | Cash flow hedging item (HFH) |  |  |
Disclosure of detailed information about financial instruments |  |  |
Hedge ratio |  | 100.00% | 100.00%
Current Asset derivatives | Currency risk related to purchases | Cash flow hedging item (HFH) | U.S. Dollars |  |  |
Disclosure of detailed information about financial instruments |  |  |
Maximum maturity date |  | 2019 | 2018
Current Assets, Notional amount |  | $ 414,000,000 | $ 110,000,000
Current Assets, Fair value and carrying value |  | $ 25,000,000 | $ 2,000,000
Rate | $ / $ |  | 1.28 | 1.24
Current Asset derivatives | Currency risk related to revenues | HFT | U.S. Dollars |  |  |
Disclosure of detailed information about financial instruments |  |  |
Maximum maturity date |  | 2019 | 2018
Current Assets, Notional amount |  | $ 74,000,000 | $ 71,000,000
Current Assets, Fair value and carrying value |  | $ 1,000,000 | $ 1,000,000
Rate | $ / $ |  | 1.36 | 1.25
Current Asset derivatives | Other market risk | Cash flow hedging item (HFH) |  |  |
Disclosure of detailed information about financial instruments |  |  |
Maximum maturity date |  | 2019 | 2018
Current Assets, Notional amount |  | $ 63,000,000 | $ 73,000,000
Current Assets, Fair value and carrying value |  | 2,000,000 | 14,000,000
Price |  | $ 45.46 | $ 40.91
Current Asset derivatives | Currency risk related to long-term debt | Cash flow hedging item (HFH) | U.S. Dollars |  |  |
Disclosure of detailed information about financial instruments |  |  |
Maximum maturity date |  | 2019 | 2018
Current Assets, Notional amount |  | $ 761,000,000 | $ 124,000,000
Current Assets, Fair value and carrying value |  | $ 21,000,000 | $ 1,000,000
Rate | $ / $ |  | 1.33 | 1.24
Other Long-Term Asset derivatives |  |  |
Disclosure of detailed information about financial instruments |  |  |
Other Long-Term Assets, Fair value and carrying value |  | $ 54,000,000 | $ 6,000,000
Other Long-Term Asset derivatives | Other market risk | Cash flow hedging item (HFH) |  |  |
Disclosure of detailed information about financial instruments |  |  |
Maximum maturity date |  | - | 2019
Price |  |  | $ 45.46
Other Long-Term Assets, Notional amount |  |  | 63,000,000
Other Long-Term Assets, Fair value and carrying value |  |  | $ 6,000,000
Other Long-Term Asset derivatives | Currency risk related to long-term debt | Cash flow hedging item (HFH) | U.S. Dollars |  |  |
Disclosure of detailed information about financial instruments |  |  |
Maximum maturity date |  | 2048 | -
Interest rate on borrowings |  | 1.28% |
Other Long-Term Assets, Notional amount |  | $ 3,134,000,000 |
Other Long-Term Assets, Fair value and carrying value |  | 54,000,000 |
Current Liabilities derivatives |  |  |
Disclosure of detailed information about financial instruments |  |  |
Current Liabilities, Fair value and carrying value |  | $ 9,000,000 | $ 33,000,000
Current Liabilities derivatives | Currency risk related to purchases | Cash flow hedging item (HFH) | U.S. Dollars |  |  |
Disclosure of detailed information about financial instruments |  |  |
Maximum maturity date |  | 2019 | 2018
Rate | $ / $ |  | 1.36 | 1.30
Current Liabilities, Notional amount |  | $ 11,000,000 | $ 376,000,000
Current Liabilities, Fair value and carrying value |  |  | $ 14,000,000
Current Liabilities derivatives | Currency risk related to revenues | HFT | U.S. Dollars |  |  |
Disclosure of detailed information about financial instruments |  |  |
Maximum maturity date |  | 2019 | -
Rate |  | 1.36 |
Current Liabilities, Notional amount |  | $ 18,000,000 |
Current Liabilities derivatives | Other market risk | Cash flow hedging item (HFH) |  |  |
Disclosure of detailed information about financial instruments |  |  |
Maximum maturity date |  | 2019 |
Price |  | $ 47.39 |
Current Liabilities, Notional amount |  | $ 2,000,000 |
Current Liabilities derivatives | Currency risk related to long-term debt | Cash flow hedging item (HFH) | U.S. Dollars |  |  |
Disclosure of detailed information about financial instruments |  |  |
Maximum maturity date |  | - | 2018
Rate | $ / $ |  |  | 1.28
Current Liabilities, Notional amount |  |  | $ 1,036,000,000
Current Liabilities, Fair value and carrying value |  |  | $ 18,000,000
Current Liabilities derivatives | Interest rate risk | Cash flow hedging item (HFH) | GOC 2.14% 10-year term note |  |  |
Disclosure of detailed information about financial instruments |  |  |
Maximum maturity date |  |  | 2018
Interest rate on borrowings |  |  | 2.14%
Debt instrument term |  |  | 10 years
Current Liabilities, Notional amount |  |  | $ 300,000,000
Current Liabilities, Fair value and carrying value |  |  | $ 1,000,000
Current Liabilities derivatives | Interest rate risk | Cash flow hedging item (HFH) | GOC 2.40% 10-year term note |  |  |
Disclosure of detailed information about financial instruments |  |  |
Maximum maturity date |  | 2019 |
Interest rate on borrowings |  | 2.40% |
Debt instrument term |  | 10 years |
Current Liabilities, Notional amount |  | $ 250,000,000 |
Current Liabilities, Fair value and carrying value |  | $ 9,000,000 |
Current Liabilities derivatives | Interest rate risk | Cash flow hedging item (HFH) | 2.64% non-fixed rate credit facility |  |  |
Disclosure of detailed information about financial instruments |  |  |
Maximum maturity date |  | 2019 |
Interest rate on borrowings |  | 2.64% |
Current Liabilities, Notional amount |  | $ 8,000,000 |
Other Long-Term Liabilities derivatives | Other market risk | Cash flow hedging item (HFH) |  |  |
Disclosure of detailed information about financial instruments |  |  |
Maximum maturity date |  | 2020 |
Price |  | $ 48.71 |
Other Long-Term Liabilities, Notional amount |  | 67,000,000 |
Other Long-Term Liabilities, Fair value and carrying value |  | $ 3,000,000 |
Other Long-Term Liabilities derivatives | Currency risk related to long-term debt | Cash flow hedging item (HFH) | U.S. Dollars |  |  |
Disclosure of detailed information about financial instruments |  |  |
Maximum maturity date |  | 2027 | 2027
Rate | $ / $ |  | 1.33 | 1.32
Other Long-Term Liabilities, Notional amount |  | $ 991,000,000 | $ 1,910,000,000
Other Long-Term Liabilities, Fair value and carrying value |  | 2,000,000 | 76,000,000
Spread included in fair value of derivative instruments | $ (1,000,000) | $ 29,000,000 | $ 4,000,000
Other Long-Term Liabilities derivatives | Interest rate risk | Cash flow hedging item (HFH) | 2.64% non-fixed rate credit facility |  |  |
Disclosure of detailed information about financial instruments |  |  |
Maximum maturity date |  | 2022 |
Other Long-Term Liabilities, Notional amount |  | $ 145,000,000 |
Other Long-Term Liabilities, Fair value and carrying value |  | $ 1,000,000 |
Non-fixed interest rate |  | 2.64% |

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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