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Long-Term Debt - Summary of Long-term Debt (Details) $ in Millions | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($)
--- | --- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | $ 14,694 |  | $ 21,453 |
Less: current portion of commercial paper | 0 |  | 544 |
current portion of other long term debt | 1,000 |  | 799 |
Long-term debt | $ 13,694 |  | $ 20,110 |
3.31% debentures due February 11, 2022 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 3.31% | 3.31% |  |
1.45% debentures due November 16, 2023 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 1.45% | 1.45% | 1.45% | 1.45%
Borrowings |  |  | $ 500 |
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% |  |
2.50% debentures due January 17, 2028 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 2.50% | 2.50% | 2.50% | 2.50%
Borrowings |  |  | $ 300 |
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, 2021 – US$901 million; December 31, 2020 – US$3,953 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | $ 901,000,000 |  | $ 3,953,000,000
Commercial paper (December 31, 2021 – US$nil;  December 31, 2020 – US$426 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings |  | $ 0 |  | $ 426,000,000
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 |  |
2.05% due July 15, 2025 (US$600 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 2.05% | 2.05% | 2.05% | 2.05%
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 |  |
2.95% due July 15, 2030 (US$500 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings, interest rate | 2.95% | 2.95% | 2.95% | 2.95%
Notional amount |  | $ 500,000,000 |  |
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 | $ 14,781 |  | $ 21,560 |
Gross carrying amount | Bank credit facilities |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 0 |  | 1,614 |
Gross carrying amount | Medium-term notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 3,200 |  | 4,814 |
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 | 1.45% debentures due November 16, 2023 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 500 |  | 500 |
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 | 2.50% debentures due January 17, 2028 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 300 |  | 300 |
Gross carrying amount | 4.85% debentures due May 30, 2047 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 300 |  | 300 |
Gross carrying amount | Long-term debt |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 11,581 |  | 16,746 |
Gross carrying amount | Bank credit facilities (December 31, 2021 – US$901 million; December 31, 2020 – US$3,953 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 1,140 |  | 5,041 |
Gross carrying amount | Commercial paper (December 31, 2021 – US$nil;  December 31, 2020 – US$426 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 0 |  | 544 |
Gross carrying amount | 3.45% due November 15, 2021 (US$500 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 0 |  | 638 |
Gross carrying amount | 2.95% due January 15, 2023 (US$1,000 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 1,266 |  | 1,276 |
Gross carrying amount | 3.80% due April 15, 2024 (US$500 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 633 |  | 638 |
Gross carrying amount | 3.90% due February 1, 2025 (US$600 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 759 |  | 765 |
Gross carrying amount | 2.05% due July 15, 2025 (US$600 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 759 |  | 765 |
Gross carrying amount | 3.85% due June 1, 2027 (US$1,250 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 1,582 |  | 1,595 |
Gross carrying amount | 2.95% due July 15, 2030 (US$500 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 633 |  | 638 |
Gross carrying amount | 7.20% due January 15, 2032 (US$400 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 506 |  | 510 |
Gross carrying amount | 6.45% due June 30, 2033 (US$350 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 443 |  | 446 |
Gross carrying amount | 5.85% due February 1, 2035 (US$350 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 443 |  | 446 |
Gross carrying amount | 6.50% due February 15, 2037 (US$450 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 570 |  | 574 |
Gross carrying amount | 6.25% due March 15, 2038 (US$1,100 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 1,392 |  | 1,403 |
Gross carrying amount | 6.75% due February 1, 2039 (US$400 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 506 |  | 510 |
Gross carrying amount | 4.95% due June 1, 2047 (US$750 million) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 949 |  | 957 |
Original issue discounts, net |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | 15 |  | 18 |
Transaction costs |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Borrowings | $ 72 |  | $ 89 |

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