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Debt And Credit Facilities (Details) CAD / shares in Units, CAD in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
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Sep. 30, 2016 CAD CAD / shares | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CAD CAD / shares | Jun. 30, 2017 USD ($) | Jun. 30, 2017 CAD | Jun. 30, 2016 USD ($) | Jun. 30, 2016 CAD | Dec. 31, 2017 CAD | Dec. 31, 2016 CAD | Feb. 28, 2018 CAD | Dec. 31, 2017 CAD | Nov. 30, 2017 | Jun. 30, 2017 CAD | Dec. 31, 2016 USD ($) | Dec. 31, 2016 CAD | Jun. 30, 2016 CAD | Feb. 05, 2016 | Feb. 04, 2016
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial papers issued |  |  |  |  |  |  |  |  |  |  | CAD 2,136.0 |  |  |  | CAD 1,273.0 |  |  |
Interest rate on notes |  | 5.50% |  |  |  |  |  |  |  |  | 5.50% |  |  | 5.70% | 5.70% |  |  |
Borrowings excluding short term debt |  |  |  |  |  |  |  |  |  |  | CAD 13,443.0 |  |  |  | CAD 16,157.0 |  |  |
Finance leases |  |  |  |  |  |  |  |  |  |  | 1,319.0 |  |  |  | 1,134.0 |  |  |
Deferred financing costs |  |  |  |  |  |  |  |  |  |  | (44.0) |  |  |  | (40.0) |  |  |
Current portion of longterm debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current finance leases |  |  |  |  |  |  |  |  |  |  | (71.0) |  |  |  | (54.0) |  |  |
Current portion of long-term debt |  |  |  |  |  |  |  |  |  |  | (71.0) |  |  |  | (54.0) |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  |  | CAD 13,372.0 |  |  |  | 16,103.0 |  |  |
Additional information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility repaid |  |  |  | $ 1,830.0 |  | $ 600.0 |  | CAD 3,283.0 | CAD 1,693.0 |  |  |  |  |  |  |  |  |
Accrued interest | $ |  |  |  |  |  | 8.0 |  |  |  |  |  |  |  |  |  |  |  |
Realized Gain on Foreign Currency Hedges |  |  |  |  | CAD 62.0 |  |  | 62.0 |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of long-term debt |  |  |  | 25.0 |  |  |  | CAD 113.0 | CAD 99.0 |  |  |  |  |  |  |  |  |
Subsidiary debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility repaid |  |  |  |  |  |  | CAD 600.0 |  |  |  |  |  |  |  |  |  |  |
Accrued interest |  |  |  |  |  | 8.0 |  |  |  |  |  |  |  |  |  | CAD 10.0 |  |
Loss on extinguishment of long-term debt |  |  |  |  |  |  | 99.0 |  |  |  |  |  |  |  |  |  |  |
Loss on debt extinguishment, net of tax |  |  |  |  |  |  | CAD 73.0 |  |  |  |  |  |  |  |  |  |  |
Debt repurchased | $ |  |  |  |  |  | 688.0 |  |  |  |  |  |  |  |  |  |  |  |
Book value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 864.0 |  |
Subsidiary debt acquired |  |  |  |  |  | $ 751.0 |  |  |  |  |  |  |  |  |  | CAD 973.0 |  |
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 |  |  |  |  |  |  |  |  |  |  | CAD 2,136.0 |  |  |  | CAD 1,273.0 |  |  |
Commercial paper | Increase in authorized borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper authorized to be issued |  |  |  |  |  |  |  |  |  | CAD 5,000.0 |  |  |  |  |  |  |  |
Commercial paper | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper authorized to be issued |  |  |  |  |  |  |  |  |  |  | CAD 4,000.0 |  |  |  |  |  |  |
Commercial paper term |  |  |  |  |  |  |  | 365 days |  |  |  |  |  |  |  |  |  |
Commercial paper | Weighted average |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes |  | 1.56% |  |  |  |  |  |  |  |  | 1.56% |  |  | 0.97% | 0.97% |  |  |
Fixed Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings excluding short term debt |  |  |  |  |  |  |  |  |  |  | CAD 12,168.0 |  |  |  | CAD 15,063.0 |  |  |
Notes 6.10 Percent Due 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes |  | 6.10% |  |  |  |  |  |  |  |  | 6.10% |  |  | 6.10% | 6.10% |  |  |
Borrowings excluding short term debt |  | $ 1,250.0 |  |  |  |  |  |  |  |  |  |  |  | $ 1,250.0 | CAD 1,678.0 |  |  |
Notes 6.05 Percent Due 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes |  | 6.05% |  |  |  |  |  |  |  |  | 6.05% |  |  | 6.05% | 6.05% |  |  |
Borrowings excluding short term debt |  | $ 600.0 |  | 1,250.0 |  |  |  |  |  |  | CAD 771.0 |  | CAD 1,700.0 | $ 600.0 | CAD 809.0 |  |  |
Additional information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility repaid |  | 614.0 | CAD 788.0 | 1,344.0 | 1,830.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued interest |  | $ 3.0 |  | $ 31.0 |  |  |  |  |  |  | CAD 4.0 |  | CAD 42.0 |  |  |  |  |
5.80% Series 4 Medium Term Notes, due 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on notes |  | 5.80% |  |  |  |  |  |  |  |  | 5.80% |  |  | 5.80% | 5.80% |  |  |
Borrowings excluding short term debt |  |  |  |  |  |  |  |  |  |  | CAD 700.0 |  |  |  | CAD 700.0 |  |  |
Additional information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility repaid |  |  | 715.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued interest |  |  |  |  |  |  |  |  |  |  | CAD 3.0 |  |  |  |  |  |  |
Loss on extinguishment of long-term debt |  |  | 26.0 |  | 25.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on debt extinguishment, net of tax |  |  | CAD 18.0 |  | CAD 10.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Notes 7.75 Percent Due 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Interest rate on notes |  | 7.75% |  |  |  |  |  |  |  |  | 7.75% |  |  | 7.75% | 7.75% |  | 7.75% |
Borrowings excluding short term debt |  | $ 223.0 |  |  |  |  |  |  |  |  | CAD 288.0 |  |  | $ 223.0 | CAD 317.0 |  |  |
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% |  |  |
Borrowings excluding short term debt |  |  |  |  |  |  |  |  |  |  | CAD 749.0 |  |  |  | CAD 748.0 |  |  |
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% |  |  |
Borrowings excluding short term debt |  | $ 300.0 |  |  |  |  |  |  |  |  | CAD 406.0 |  |  | $ 300.0 | CAD 440.0 |  |  |
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% |  |  |
Borrowings excluding short term debt |  | $ 220.0 |  |  |  |  |  |  |  |  | CAD 298.0 |  |  | $ 220.0 | CAD 325.0 |  |  |
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% |  | 4.50% |
Borrowings excluding short term debt |  | $ 182.0 |  |  |  |  |  |  |  |  | CAD 212.0 |  |  | $ 182.0 | CAD 225.0 |  |  |
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% |  |  |
Borrowings excluding short term debt |  | $ 750.0 |  |  |  |  |  |  |  |  | CAD 936.0 |  |  | $ 750.0 | CAD 1,002.0 |  |  |
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% | 3.00% |  |  |
Borrowings excluding short term debt |  |  |  |  |  |  |  |  |  |  | CAD 698.0 |  |  |  | CAD 698.0 |  |  |
Additional information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes issued | CAD 700.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issue price | CAD / shares | CAD 99.751 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument effective yield percentage | 3.029% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |
Borrowings excluding short term debt |  | $ 275.0 |  |  |  |  |  |  |  |  | CAD 365.0 |  |  | $ 275.0 | CAD 391.0 |  |  |
Notes 8.20 Percent Due 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Interest rate on notes |  | 8.20% |  |  |  |  |  |  |  |  | 8.20% |  |  | 8.20% | 8.20% |  | 8.20% |
Borrowings excluding short term debt |  | $ 59.0 |  |  |  |  |  |  |  |  | CAD 81.0 |  |  | $ 59.0 | CAD 87.0 |  |  |
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% |  |  |
Borrowings excluding short term debt |  | $ 250.0 |  |  |  |  |  |  |  |  | CAD 319.0 |  |  | $ 250.0 | CAD 342.0 |  |  |
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% |  |  |
Borrowings excluding short term debt |  | $ 500.0 |  |  |  |  |  |  |  |  | CAD 626.0 |  |  | $ 500.0 | CAD 670.0 |  |  |
Notes 5.35 Percent Due 2033 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Interest rate on notes |  | 5.35% |  |  |  |  |  |  |  |  | 5.35% |  |  | 5.35% | 5.35% |  |  |
Borrowings excluding short term debt |  | $ 300.0 |  |  |  |  |  |  |  |  | CAD 344.0 |  |  | $ 300.0 | CAD 368.0 |  |  |
Notes 5.95 Percent Due 2034 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Interest rate on notes |  | 5.95% |  |  |  |  |  |  |  |  | 5.95% |  |  | 5.95% | 5.95% |  |  |
Borrowings excluding short term debt |  | $ 500.0 |  |  |  |  |  |  |  |  | CAD 625.0 |  |  | $ 500.0 | CAD 669.0 |  |  |
Notes 5.95 Percent Due 2035 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Interest rate on notes |  | 5.95% |  |  |  |  |  |  |  |  | 5.95% |  |  | 5.95% | 5.95% |  |  |
Borrowings excluding short term debt |  | $ 600.0 |  |  |  |  |  |  |  |  | CAD 718.0 |  |  | $ 600.0 | CAD 769.0 |  |  |
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% |  |  |
Borrowings excluding short term debt |  |  |  |  |  |  |  |  |  |  | CAD 599.0 |  |  |  | CAD 599.0 |  |  |
Notes 6.50 Percent Due 2038 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Interest rate on notes |  | 6.50% |  |  |  |  |  |  |  |  | 6.50% |  |  | 6.50% | 6.50% |  |  |
Borrowings excluding short term debt |  | $ 1,150.0 |  |  |  |  |  |  |  |  | CAD 1,439.0 |  |  | $ 1,150.0 | CAD 1,540.0 |  |  |
Notes 6.80 Percent Due 2038 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Interest rate on notes |  | 6.80% |  |  |  |  |  |  |  |  | 6.80% |  |  | 6.80% | 6.80% |  |  |
Borrowings excluding short term debt |  | $ 900.0 |  |  |  |  |  |  |  |  | CAD 1,151.0 |  |  | $ 900.0 | CAD 1,231.0 |  |  |
Notes 6.85 Percent Due 2039 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Interest rate on notes |  | 6.85% |  |  |  |  |  |  |  |  | 6.85% |  |  | 6.85% | 6.85% |  |  |
Borrowings excluding short term debt |  | $ 750.0 |  |  |  |  |  |  |  |  | CAD 938.0 |  |  | $ 750.0 | CAD 1,004.0 |  |  |
Notes 6.00 Percent Due 2042 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Interest rate on notes |  | 6.00% |  |  |  |  |  |  |  |  | 6.00% |  |  | 6.00% | 6.00% |  | 6.00% |
Borrowings excluding short term debt |  | $ 152.0 |  |  |  |  |  |  |  |  | CAD 140.0 |  |  | $ 152.0 | CAD 151.0 |  |  |
Notes 4.00 Percent Due 2047 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Interest rate on notes |  | 4.00% |  |  |  |  |  |  |  |  | 4.00% |  |  | 4.00% | 4.00% |  |  |
Borrowings excluding short term debt |  | $ 750.0 |  |  |  |  |  |  |  |  | CAD 936.0 |  |  | $ 750.0 |  |  |  |
Additional information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes issued | $ |  | $ 750.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issue price | CAD / shares |  |  | CAD 99.498 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument effective yield percentage |  | 4.029% |  |  |  |  |  |  |  |  | 4.029% | 4.029% |  |  |  |  |  |
4.34% Series 5 Medium Term Notes, due 2046 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Interest rate on notes | 4.34% | 4.34% |  |  |  |  |  |  |  |  | 4.34% |  |  | 4.34% | 4.34% |  |  |
Borrowings excluding short term debt |  |  |  |  |  |  |  |  |  |  | CAD 300.0 |  |  |  | CAD 300.0 |  |  |
Additional information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes issued | CAD 300.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issue price | CAD / shares | CAD 99.900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument effective yield percentage | 4.346% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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