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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