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Debt And Credit Facilities (Details) $ / shares in Units, $ in Millions, $ in Millions | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CAD ($) $ / shares | Jun. 30, 2017 USD ($) | Jun. 30, 2017 CAD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($) | Nov. 30, 2017 | Jun. 30, 2017 CAD ($) | Feb. 05, 2016 | Feb. 04, 2016
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial papers issued |  |  |  |  |  |  |  |  | $ 3,231.0 | $ 2,136.0 |  |  |  |
Interest rate on notes | 5.40% |  | 5.50% |  |  |  |  |  | 5.40% | 5.50% |  |  |  |
Finance leases |  |  |  |  |  |  |  |  | $ 1,260.0 | $ 1,319.0 |  |  |  |
Deferred financing costs |  |  |  |  |  |  |  |  | (41.0) | (44.0) |  |  |  |
Longterm borrowings net of deferred financing costs |  |  |  |  |  |  |  |  | 14,119.0 | 13,443.0 |  |  |  |
Current portion of longterm debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current finance leases |  |  |  |  |  |  |  |  | (38.0) | (71.0) |  |  |  |
Long - term debt |  |  |  |  |  |  |  |  | (191.0) |  |  |  |  |
Current portion of long-term debt |  |  |  |  |  |  |  |  | (229.0) | (71.0) |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  | $ 13,890.0 | 13,372.0 |  |  |  |
Additional information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt repaid |  |  |  |  |  |  | $ 186.0 | $ 3,283.0 |  |  |  |  |  |
Loss on extinguishment of long-term debt |  |  |  |  |  |  | $ 3.0 | 113.0 |  |  |  |  |  |
Realized Gain on Foreign Currency Hedges |  |  |  |  |  |  |  | $ 62.0 |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finance lease interest rate | 2.9 |  |  |  |  |  |  |  | 2.9 |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finance lease interest rate | 16.5 |  |  |  |  |  |  |  | 16.5 |  |  |  |  |
Commercial paper |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial papers issued |  |  |  |  |  |  |  |  | $ 3,231.0 | $ 2,136.0 |  |  |  |
Commercial paper | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper authorized to be issued |  |  |  |  |  |  |  |  | $ 5,000.0 |  |  |  |  |
Commercial paper term |  |  |  |  |  |  | 365 days |  |  |  |  |  |  |
Commercial paper | Weighted average |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes | 2.88% |  | 1.56% |  |  |  |  |  | 2.88% | 1.56% |  |  |  |
Fixed Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
total unsecured long term debt |  |  |  |  |  |  |  |  | $ 12,900.0 | $ 12,168.0 |  |  |  |
Notes 6.05 Percent Due 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt repaid |  |  | $ 600.0 |  |  |  |  |  |  |  |  |  |  |
Book value |  |  |  |  |  |  |  |  |  | 771.0 |  |  |  |
Original borrowings maturity amount |  |  | 614.0 |  |  |  |  |  |  | 788.0 |  |  |  |
Accrued interest |  |  | $ 3.0 |  |  |  |  |  |  | 4.0 |  |  |  |
Notes 6.10 Percent Due 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt repaid |  |  |  |  | $ 1,250.0 |  |  |  |  |  |  |  |  |
Book value |  |  |  |  |  |  |  |  |  |  |  | $ 1,700.0 |  |
Original borrowings maturity amount |  |  |  |  | 1,344.0 |  |  |  |  |  |  | 1,830.0 |  |
Accrued interest |  |  |  |  | $ 31.0 |  |  |  |  |  |  | $ 42.0 |  |
Loss on extinguishment of long-term debt |  |  |  |  |  | $ 25.0 |  |  |  |  |  |  |  |
Loss on debt extinguishment, net of tax |  |  |  |  |  | 10.0 |  |  |  |  |  |  |  |
Realized Gain on Foreign Currency Hedges |  |  |  |  |  | $ 62.0 |  |  |  |  |  |  |  |
5.80% Series 4 Medium Term Notes, due 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt repaid |  |  |  | $ 700.0 |  |  |  |  |  |  |  |  |  |
Original borrowings maturity amount |  |  |  |  |  |  |  |  |  | 715.0 |  |  |  |
Accrued interest |  |  |  |  |  |  |  |  |  | $ 3.0 |  |  |  |
Loss on extinguishment of long-term debt |  |  |  | 26.0 |  |  |  |  |  |  |  |  |  |
Loss on debt extinguishment, net of tax |  |  |  | $ 18.0 |  |  |  |  |  |  |  |  |  |
Notes 7.75 Percent Due 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes | 7.75% |  | 7.75% |  |  |  |  |  | 7.75% | 7.75% |  |  |  |
total unsecured long term debt |  |  |  |  |  |  |  |  | $ 191.0 | $ 288.0 |  |  |  |
Additional information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt repaid | $ 83.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Book value |  |  |  |  |  |  |  |  | 109.0 |  |  |  |  |
Original borrowings maturity amount | 88.0 |  |  |  |  |  |  |  | 116.0 |  |  |  |  |
Accrued interest | $ 3.0 |  |  |  |  |  |  |  | $ 4.0 |  |  |  |  |
Loss on extinguishment of long-term debt |  | $ 3.0 |  |  |  |  |  |  |  |  |  |  |  |
Loss on debt extinguishment, net of tax |  | $ 2.0 |  |  |  |  |  |  |  |  |  |  |  |
3.10% Series 5 Medium Term Notes, due 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes | 3.10% |  | 3.10% |  |  |  |  |  | 3.10% | 3.10% |  |  |  |
total unsecured long term debt |  |  |  |  |  |  |  |  | $ 749.0 | $ 749.0 |  |  |  |
Debentures 9.25 Percent Due 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes | 9.25% |  | 9.25% |  |  |  |  |  | 9.25% | 9.25% |  |  |  |
total unsecured long term debt | $ 300.0 |  | $ 300.0 |  |  |  |  |  | $ 431.0 | $ 406.0 |  |  |  |
Notes 9.40 Percent Due 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes | 9.40% |  | 9.40% |  |  |  |  |  | 9.40% | 9.40% |  |  |  |
total unsecured long term debt |  |  |  |  |  |  |  |  | $ 315.0 | $ 298.0 |  |  |  |
Additional information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revised debt coupon rate following ratings downgrade by Moodys |  |  |  |  |  |  |  |  |  |  |  |  | 9.40% | 7.90%
Notes 4.50 Percent Due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes | 4.50% |  | 4.50% |  |  |  |  |  | 4.50% | 4.50% |  |  |  |
total unsecured long term debt |  |  |  |  |  |  |  |  | $ 234.0 | $ 212.0 |  |  |  |
Notes 3.60 Percent Due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes | 3.60% |  | 3.60% |  |  |  |  |  | 3.60% | 3.60% |  |  |  |
total unsecured long term debt | $ 750.0 |  | $ 750.0 |  |  |  |  |  | $ 1,020.0 | $ 936.0 |  |  |  |
3.00% Series 5 Medium Term Notes, due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes | 3.00% |  | 3.00% |  |  |  |  |  | 3.00% | 3.00% |  |  |  |
total unsecured long term debt |  |  |  |  |  |  |  |  | $ 698.0 | $ 698.0 |  |  |  |
Debentures 7.875 Percent Due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes | 7.875% |  | 7.875% |  |  |  |  |  | 7.875% | 7.875% |  |  |  |
total unsecured long term debt | $ 275.0 |  | $ 275.0 |  |  |  |  |  | $ 393.0 | $ 365.0 |  |  |  |
Notes 8.20 Percent Due 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes | 8.20% |  | 8.20% |  |  |  |  |  | 8.20% | 8.20% |  |  |  |
total unsecured long term debt |  |  |  |  |  |  |  |  | $ 87.0 | $ 81.0 |  |  |  |
Debentures 7.00 Percent Due 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes | 7.00% |  | 7.00% |  |  |  |  |  | 7.00% | 7.00% |  |  |  |
total unsecured long term debt | $ 250.0 |  | $ 250.0 |  |  |  |  |  | $ 346.0 | $ 319.0 |  |  |  |
Notes 7.15 Percent Due 2032 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes | 7.15% |  | 7.15% |  |  |  |  |  | 7.15% | 7.15% |  |  |  |
total unsecured long term debt | $ 500.0 |  | $ 500.0 |  |  |  |  |  | $ 681.0 | $ 626.0 |  |  |  |
Notes 5.35 Percent Due 2033 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes | 5.35% |  | 5.35% |  |  |  |  |  | 5.35% | 5.35% |  |  |  |
total unsecured long term debt | $ 300.0 |  | $ 300.0 |  |  |  |  |  | $ 379.0 | $ 344.0 |  |  |  |
Notes 5.95 Percent Due 2034 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes | 5.95% |  | 5.95% |  |  |  |  |  | 5.95% | 5.95% |  |  |  |
total unsecured long term debt | $ 500.0 |  | $ 500.0 |  |  |  |  |  | $ 680.0 | $ 625.0 |  |  |  |
Notes 5.95 Percent Due 2035 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes | 5.95% |  | 5.95% |  |  |  |  |  | 5.95% | 5.95% |  |  |  |
total unsecured long term debt | $ 600.0 |  | $ 600.0 |  |  |  |  |  | $ 786.0 | $ 718.0 |  |  |  |
5.39% Series 4 Medium Term Notes, due 2037 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes | 5.39% |  | 5.39% |  |  |  |  |  | 5.39% | 5.39% |  |  |  |
total unsecured long term debt |  |  |  |  |  |  |  |  | $ 599.0 | $ 599.0 |  |  |  |
Notes 6.50 Percent Due 2038 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes | 6.50% |  | 6.50% |  |  |  |  |  | 6.50% | 6.50% |  |  |  |
total unsecured long term debt | $ 1,150.0 |  | $ 1,150.0 |  |  |  |  |  | $ 1,565.0 | $ 1,439.0 |  |  |  |
Notes 6.80 Percent Due 2038 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes | 6.80% |  | 6.80% |  |  |  |  |  | 6.80% | 6.80% |  |  |  |
total unsecured long term debt | $ 900.0 |  | $ 900.0 |  |  |  |  |  | $ 1,249.0 | $ 1,151.0 |  |  |  |
Notes 6.85 Percent Due 2039 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes | 6.85% |  | 6.85% |  |  |  |  |  | 6.85% | 6.85% |  |  |  |
total unsecured long term debt | $ 750.0 |  | $ 750.0 |  |  |  |  |  | $ 1,021.0 | $ 938.0 |  |  |  |
Notes 6.00 Percent Due 2042 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes | 6.00% |  | 6.00% |  |  |  |  |  | 6.00% | 6.00% |  |  |  |
total unsecured long term debt |  |  |  |  |  |  |  |  | $ 158.0 | $ 140.0 |  |  |  |
Notes 4.00 Percent Due 2047 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes | 4.00% |  | 4.00% |  |  |  |  |  | 4.00% | 4.00% |  |  |  |
total unsecured long term debt |  |  |  |  |  |  |  |  | $ 1,018.0 | $ 936.0 |  |  |  |
Additional information |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes issued |  |  | $ 750.0 |  |  |  |  |  |  |  |  |  |  |
Debt instrument issue price | $ / shares |  |  |  | $ 99.498 |  |  |  |  |  |  |  |  |  |
Debt instrument effective yield percentage |  |  | 4.029% |  |  |  |  |  |  | 4.029% | 4.029% |  |  |
4.34% Series 5 Medium Term Notes, due 2046 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes | 4.34% |  | 4.34% |  |  |  |  |  | 4.34% | 4.34% |  |  |  |
total unsecured long term debt |  |  |  |  |  |  |  |  | $ 300.0 | $ 300.0 |  |  |  |

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- Definition The amount of current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Represents the amount of commercial paper that is authorised to be issued. + References No definition available. + Details
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- Definition Represents the issue term for commercial paper. + References No definition available. + Details
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- Definition The current portion of non-current borrowings excluding current finance leases. + References No definition available. + Details
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- Definition Represents the effective yield rate of the debt instrument. Effective yield is the total yield an investor receives in relation to the nominal yield or coupon of a bond. + References No definition available. + Details
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- Definition Represents the amount of deferred financing costs. + References No definition available. + Details
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- Definition Represents the interest rate on finance lease. + References No definition available. + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References No definition available. + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity, net of tax. + References No definition available. + Details
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- Definition The amount of long-term borrowing, including current portion. + References No definition available. + Details
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- Definition The amount of long term debt before accrued charges and issuance costs. + References No definition available. + Details
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- Definition The original amount that was scheduled to mature when the loan was originated. + References No definition available. + Details
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- Definition The amount of realized gain on foreign currency hedges. + References No definition available. + Details
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- Definition Represents the revised coupon rate of the debt following a ratings downgrade by Moodys. + References No definition available. + Details
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- Definition Face amount of the subsidiary debt that was repurchased. + References No definition available. + Details
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