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Long-Term Debt - Summary of Long-term Debt (Details) $ in Millions | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 CAD ($)
--- | --- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | $ 20,982 |  | $ 20,623
Less: current portion of commercial paper |  | 329 |  | 141
Current portion of other long-term debt |  | 2,062 |  | 1,000
Long-term debt |  | $ 18,591 |  | $ 19,482
3.05% debentures due June 19, 2019 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 3.05% | 3.05% | 3.05% | 3.05%
2.60% debentures due December 3, 2019 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 2.60% | 2.60% | 2.60% | 2.60%
2.05% debentures due June 1, 2020 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 2.05% | 2.05% |  |
2.89% debentures due August 14, 2020 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 2.89% | 2.89% |  |
3.31% debentures due February 11, 2022 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 3.31% | 3.31% |  |
3.55% debentures due June 3, 2024 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 3.55% | 3.55% |  |
3.42% debentures due December 1, 2026 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 3.42% | 3.42% |  |
4.85% debentures due May 30, 2047 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 4.85% | 4.85% |  |
Bank credit facilities (December 31, 2019 – US$3,745 million; December 31, 2018 – US$2,954 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | $ 3,745,000,000 |  | $ 2,954,000,000 |
Commercial paper (December 31, 2019 – US$254 million; December 31, 2018 – US$104 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Notional amount | $ 254,000,000 |  | $ 104,000,000 |
3.45% due November 15, 2021 (US$500 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 3.45% | 3.45% |  |
Notional amount | $ 500,000,000 |  |  |
2.95% due January 15, 2023 (US$1,000 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 2.95% | 2.95% |  |
Notional amount | $ 1,000,000,000 |  |  |
3.80% due April 15, 2024 (US$500 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 3.80% | 3.80% |  |
Notional amount | $ 500,000,000 |  |  |
3.90% due February 1, 2025 (US$600 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 3.90% | 3.90% |  |
Notional amount | $ 600,000,000 |  |  |
3.85% due June 1, 2027 (US$1,250 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 3.85% | 3.85% |  |
Notional amount | $ 1,250,000,000 |  |  |
7.20% due January 15, 2032 (US$400 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 7.20% | 7.20% |  |
Notional amount | $ 400,000,000 |  |  |
6.45% due June 30, 2033 (US$350 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 6.45% | 6.45% |  |
Notional amount | $ 350,000,000 |  |  |
5.85% due February 1, 2035 (US$350 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 5.85% | 5.85% |  |
Notional amount | $ 350,000,000 |  |  |
6.50% due February 15, 2037 (US$450 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 6.50% | 6.50% |  |
Notional amount | $ 450,000,000 |  |  |
6.25% due March 15, 2038 (US$1,100 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 6.25% | 6.25% |  |
Notional amount | $ 1,100,000,000 |  |  |
6.75% due February 1, 2039 (US$400 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 6.75% | 6.75% |  |
Notional amount | $ 400,000,000 |  |  |
4.95% due June 1, 2047 (US$750 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 4.95% | 4.95% |  |
Notional amount | $ 750,000,000 |  |  |
Gross carrying amount |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | $ 21,090 |  | $ 20,742
Gross carrying amount | Bank credit facilities |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | 1,688 |  | 831
Gross carrying amount | 3.05% debentures due June 19, 2019 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | 0 |  | 500
Gross carrying amount | 2.60% debentures due December 3, 2019 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | 0 |  | 500
Gross carrying amount | 2.05% debentures due June 1, 2020 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | 900 |  | 900
Gross carrying amount | 2.89% debentures due August 14, 2020 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | 1,000 |  | 1,000
Gross carrying amount | 3.31% debentures due February 11, 2022 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | 1,000 |  | 1,000
Gross carrying amount | 3.55% debentures due June 3, 2024 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | 500 |  | 500
Gross carrying amount | 3.42% debentures due December 1, 2026 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | 600 |  | 600
Gross carrying amount | 4.85% debentures due May 30, 2047 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | 300 |  | 300
Gross carrying amount | Medium-term notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | 5,988 |  | 6,131
Gross carrying amount | Bank credit facilities (December 31, 2019 – US$3,745 million; December 31, 2018 – US$2,954 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | 4,855 |  | 4,031
Gross carrying amount | Commercial paper (December 31, 2019 – US$254 million; December 31, 2018 – US$104 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | 329 |  | 141
Gross carrying amount | 3.45% due November 15, 2021 (US$500 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | 648 |  | 682
Gross carrying amount | 2.95% due January 15, 2023 (US$1,000 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | 1,296 |  | 1,364
Gross carrying amount | 3.80% due April 15, 2024 (US$500 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | 648 |  | 682
Gross carrying amount | 3.90% due February 1, 2025 (US$600 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | 778 |  | 819
Gross carrying amount | 3.85% due June 1, 2027 (US$1,250 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | 1,621 |  | 1,706
Gross carrying amount | 7.20% due January 15, 2032 (US$400 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | 519 |  | 546
Gross carrying amount | 6.45% due June 30, 2033 (US$350 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | 454 |  | 478
Gross carrying amount | 5.85% due February 1, 2035 (US$350 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | 454 |  | 478
Gross carrying amount | 6.50% due February 15, 2037 (US$450 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | 583 |  | 614
Gross carrying amount | 6.25% due March 15, 2038 (US$1,100 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | 1,426 |  | 1,501
Gross carrying amount | 6.75% due February 1, 2039 (US$400 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | 519 |  | 546
Gross carrying amount | 4.95% due June 1, 2047 (US$750 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | 972 |  | 1,023
Gross carrying amount | Long-term debt |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | 15,102 |  | 14,611
Original issue discounts, net |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | 17 |  | 17
Transaction costs |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | $ 91 |  | $ 102

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