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Financial Instruments - Maturity Dates for Financial Liabilities (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items] |  |  |
Accounts payable | $ 816 | $ 779 |
Accrued liabilities | 2,611 | 2,356 |
Long-term debt | 20,982 | 20,623 |
Other long-term liabilities | 7,363 | 3,890 |
Interest and other financing expense | 912 | 798 | $ 728
Gross carrying amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term debt | 21,090 | $ 20,742 |
Less than 1 year |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Lease Payments Included In Liablities | 233 |  |
Less than 1 year | Gross carrying amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term debt | 2,391 |  |
1 to less than 2 years |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Lease Payments Included In Liablities | 171 |  |
1 to less than 2 years | Gross carrying amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term debt | 1,552 |  |
2 to less than 5 years |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Lease Payments Included In Liablities | 391 |  |
Thereafter |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Lease Payments Included In Liablities | 1,014 |  |
Thereafter | Gross carrying amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term debt | 8,226 |  |
Liquidity risk | Less than 1 year |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Accounts payable | 816 |  |
Accrued liabilities | 2,611 |  |
Other long-term liabilities | 370 |  |
Liquidity risk | Less than 1 year | Gross carrying amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term debt | 2,391 |  |
Interest and other financing expense | 881 |  |
Liquidity risk | 1 to less than 2 years |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Accounts payable | 0 |  |
Accrued liabilities | 0 |  |
Other long-term liabilities | 196 |  |
Liquidity risk | 1 to less than 2 years | Gross carrying amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term debt | 1,552 |  |
Interest and other financing expense | 813 |  |
Liquidity risk | 2 to less than 5 years |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Accounts payable | 0 |  |
Accrued liabilities | 0 |  |
Other long-term liabilities | 436 |  |
Liquidity risk | 2 to less than 5 years | Gross carrying amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term debt | 8,921 |  |
Interest and other financing expense | 1,771 |  |
Liquidity risk | Thereafter |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Accounts payable | 0 |  |
Accrued liabilities | 0 |  |
Other long-term liabilities | 1,014 |  |
Liquidity risk | Thereafter | Gross carrying amount |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Long-term debt | 8,226 |  |
Interest and other financing expense | $ 4,856 |  |

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