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Long-Term Debt - Narrative (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2019 GBP (£) | Jul. 31, 2019 USD ($) | Jul. 31, 2019 CAD ($) | Dec. 31, 2018 GBP (£)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Letters of credit and guarantees outstanding | $ 468,000,000 |  |  |  |  |
Bank credit facilities |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Maximum credit facility | 4,959,000,000 |  |  |  |  |
Undrawn borrowing facilities | 4,737,000,000 |  |  |  |  |
Term Credit Facility |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Maximum credit facility | 6,650,000,000 |  |  |  |  |
Demand credit facility |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Maximum credit facility | 100,000,000 |  | £ 5,000,000 |  |  | £ 15,000,000
Non-revolving term credit facility maturing February 2021 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Maximum credit facility | 750,000,000 |  |  |  |  |
Revolving syndicated credit facility maturing June 2022 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Maximum credit facility | 2,425,000,000 |  |  |  |  |
Non-revolving term credit facility maturing June 2022 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Maximum credit facility | $ 3,250,000,000 |  |  |  |  |
Credit facility annual amortization rate | 5.00% |  |  |  |  |
Non-revolving term credit facility maturing february 2023 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Maximum credit facility | $ 2,650,000,000 |  |  |  |  |
Revolving syndicated credit facility maturing June 2023 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Maximum credit facility | 2,425,000,000 |  |  |  |  |
Non-revolving term credit facility maturing May 2020 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Repayments of lines of credit | 1,800,000,000 |  |  |  |  |
Non-revolving term credit facility maturing October 2020 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Maximum credit facility | 2,200,000,000 |  |  |  |  |
Revolving syndicated credit facility maturing June 2019 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Maximum credit facility | 330,000,000 |  |  |  |  |
Revolving syndicated credit facility maturing June 2021 to June 2023 [Member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Maximum credit facility | 2,095,000,000 |  |  |  |  |
Commercial Paper |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Maximum credit facility | $ 2,500,000,000 |  |  |  |  |
Credit facilities and commercial paper | Weighted average |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings, interest rate | 2.50% |  | 2.50% |  |  | 2.60%
Long-term debt | Weighted average |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings, interest rate | 4.00% |  | 4.00% |  |  | 3.90%
2.60% debentures due December 3, 2019 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings, interest rate | 2.60% |  | 2.60% |  |  | 2.60%
Repayments of borrowings | $ 500,000,000 |  |  |  |  |
3.05% debentures due June 19, 2019 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings, interest rate | 3.05% |  | 3.05% |  |  | 3.05%
Repayments of borrowings | $ 500,000,000 |  |  |  |  |
Medium-Term Borrowings Expiring August 2019 |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Base shell prospectus borrowings |  |  |  |  | $ 3,000,000,000 |
US dollar denominated debt, unsecured |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Base shell prospectus borrowings |  |  |  | $ 3,000,000,000 |  |
1.75% due January 15, 2018 (US$600 million) |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  | 1.75%
Repayments of borrowings |  | $ 600,000,000 |  |  |  |
5.90% due February 1, 2018 (US$400 million) |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  | 5.90%
Repayments of borrowings |  | $ 400,000,000 |  |  |  |

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