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Long-Term Debt - Narrative (Details) £ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2021 CAD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 GBP (£) | Dec. 30, 2021 CAD ($) | Dec. 31, 2020 USD ($) | Jun. 27, 2019 CAD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Repayments of borrowings | $ 183,000,000 |  | $ 397,000,000 |  | $ 0 |  |  |  |  |
Letters of credit and guarantees outstanding | 513,000,000 |  | 489,000,000 |  |  |  |  |  |  |
Borrowings | 14,694,000,000 |  | 21,453,000,000 |  |  |  |  |  |  |
Gross carrying amount |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Borrowings | 14,781,000,000 |  | 21,560,000,000 |  |  |  |  |  |  |
Bank credit facilities |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Maximum credit facility | 6,098,000,000 |  |  |  |  |  |  |  |  |
Term Credit Facility |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Maximum credit facility | 1,150,000,000 |  |  |  |  |  |  |  |  |
Demand credit facility |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Maximum credit facility | 100,000,000 |  |  |  |  |  | £ 5 |  |  |
Term Credit Facility Maturing February 2023 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Maximum credit facility | 1,000,000,000 |  |  |  |  |  |  |  |  |
Non-revolving term credit facility maturing February 2023 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Maximum credit facility | 1,150,000,000 |  |  |  |  |  |  | $ 2,650,000,000 |  |
Repayments of borrowings | 1,500,000,000 |  |  |  |  |  |  |  |  |
Revolving Syndicated Credit Facility Maturing June 2022 And June 2024 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Maximum credit facility | 2,495,000,000 |  |  |  |  |  |  |  |  |
Revolving syndicated credit facility maturing June 2022 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Maximum credit facility | 70,000,000 |  |  |  |  |  |  |  |  |
Maximum borrowing capacity increased | 70,000,000 |  |  |  |  |  |  |  |  |
Maximum borrowing capacity not extended | 70,000,000 |  |  |  |  |  |  |  |  |
Revolving syndicated credit facility maturing June 2024 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Maximum credit facility | 2,425,000,000 |  |  |  |  |  |  |  |  |
Maximum borrowing capacity, term extended | 2,425,000,000 |  |  |  |  |  |  |  |  |
Revolving Syndicated Credit Facility Maturing June 2023 And June 2025 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Maximum credit facility | 2,495,000,000 |  |  |  |  |  |  |  |  |
Revolving syndicated credit facility maturing June 2023 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Maximum credit facility | 70,000,000 |  |  |  |  |  |  |  |  |
Maximum borrowing capacity not extended | 70,000,000 |  |  |  |  |  |  |  |  |
Revolving syndicated credit facility maturing June 2025 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Maximum credit facility | 2,425,000,000 |  |  |  |  |  |  |  |  |
Maximum borrowing capacity, term extended | 2,425,000,000 |  |  |  |  |  |  |  |  |
Maximum borrowing capacity increased | 70,000,000 |  |  |  |  |  |  |  |  |
Non-revolving term credit facility maturing February 2022 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Maximum credit facility | 1,000,000,000 |  |  |  |  |  |  |  |  |
Non-Revolving Term Credit Facility Maturing March 2022 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Maximum credit facility re draw | 1,000,000,000 |  |  |  |  |  |  |  |  |
Non-revolving term credit facility maturing June 2022 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Maximum credit facility |  |  |  |  | $ 3,250,000,000 |  |  |  |  | $ 3,250,000,000
Repayments of borrowings | 3,088,000,000 |  |  |  |  |  |  |  |  |
Commercial Paper |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Maximum credit facility |  |  |  |  |  | $ 2,500,000,000 |  |  |  |
Borrowings |  |  |  |  |  | $ 0 |  |  | $ 426,000,000 |
Commercial Paper | Gross carrying amount |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Borrowings | $ 0 |  | $ 544,000,000 |  |  |  |  |  |  |
Credit facilities and commercial paper | Weighted average |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate | 0.80% |  | 1.10% |  |  | 0.80% | 0.80% |  | 1.10% |
Long-term debt | Gross carrying amount |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Borrowings | $ 11,581,000,000 |  | $ 16,746,000,000 |  |  |  |  |  |  |
Long-term debt | Weighted average |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate | 3.50% |  | 3.50% |  |  | 3.50% | 3.50% |  | 3.50% |
Medium-term borrowings expiring August 2023 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Base shell prospectus borrowings, authorized | $ 3,000,000,000 |  |  |  |  |  |  |  |  |
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% |  | 1.45% |
Borrowings |  |  | $ 500,000,000 |  |  |  |  |  |  |
1.45% debentures due November 16, 2023 | Gross carrying amount |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Borrowings | $ 500,000,000 |  | $ 500,000,000 |  |  |  |  |  |  |
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% |  | 2.50% |
Borrowings |  |  | $ 300,000,000 |  |  |  |  |  |  |
2.50% debentures due January 17, 2028 | Gross carrying amount |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Borrowings | $ 300,000,000 |  | 300,000,000 |  |  |  |  |  |  |
2.89% debentures due August 14, 2020 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Repayments of borrowings |  |  | $ 1,000,000,000 |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 2.89% |  |  |  |  |  | 2.89% |
2.05% debentures due June 1, 2020 |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Repayments of borrowings |  |  | $ 900,000,000 |  |  |  |  |  |  |
Borrowings, interest rate |  |  | 2.05% |  |  |  |  |  | 2.05% |
US dollar denominated debt, unsecured |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Repayments of borrowings |  | $ 500,000,000 |  |  |  |  |  |  |  |
Borrowings, interest rate | 3.45% |  |  |  |  | 3.45% | 3.45% |  |  |
Base shell prospectus borrowings, authorized |  |  |  |  |  | $ 3,000,000,000 |  |  |  |
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% |  | 2.05% |
Proceeds from borrowings |  |  |  | $ 600,000,000 |  |  |  |  |  |
2.05% due July 15, 2025 (US$600 million) | Gross carrying amount |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Borrowings | $ 759,000,000 |  | $ 765,000,000 |  |  |  |  |  |  |
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% |  | 2.95% |
Proceeds from borrowings |  |  |  | $ 500,000,000 |  |  |  |  |  |
2.95% due July 15, 2030 (US$500 million) | Gross carrying amount |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |
Borrowings | $ 633,000,000 |  | $ 638,000,000 |  |  |  |  |  |  |

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