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Debt and Capital Structure - Unsecured Notes (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
CAD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Jan. 10, 2022
Dec. 31, 2021
USD ($)
Oct. 31, 2021
USD ($)
Sep. 13, 2021
USD ($)
Jan. 01, 2021
CAD ($)
Jan. 01, 2021
USD ($)
Dec. 31, 2020
USD ($)
Disclosure of detailed information about borrowings [line items]                    
Long-Term Debt $ 12,385 $ 7,441                
Repayments of long-term debt 2,870 112 $ 2,279              
Total debt principal         $ 7,400         $ 5,900
Long-Term Debt                    
Disclosure of detailed information about borrowings [line items]                    
Repayments of long-term debt 2,870 112 $ 2,279              
Total debt principal 12,113 7,510     $ 7,385         5,898
Unsecured Notes                    
Disclosure of detailed information about borrowings [line items]                    
Principal amount of debt repayments           $ 2,300        
Total debt principal           $ 2,200        
Canadian Dollar Denominated Unsecured Notes | Long-Term Debt                    
Disclosure of detailed information about borrowings [line items]                    
Total debt principal $ 2,750 0                
Canadian Dollar Denominated Unsecured Notes | 3.55% due March 12, 2025 | Long-Term Debt                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt, interest rate 3.55%       3.55%          
Total debt principal $ 750 0                
Canadian Dollar Denominated Unsecured Notes | 3.60% due March 10, 2027 | Long-Term Debt                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt, interest rate 3.60%       3.60%          
Total debt principal $ 750 0                
Canadian Dollar Denominated Unsecured Notes | 3.50% due February 7, 2028 | Long-Term Debt                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt, interest rate 3.50%       3.50%          
Total debt principal $ 1,250 0                
Canadian Dollar Denominated Unsecured Notes | The Arrangement                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt, fair value               $ 2,900    
Long-Term Debt               2,800    
U.S. Dollar Denominated Unsecured Notes | Long-Term Debt                    
Disclosure of detailed information about borrowings [line items]                    
Total debt principal $ 9,363 7,510     $ 7,385         5,898
U.S. Dollar Denominated Unsecured Notes | 6.80% due September 15, 2037 | Long-Term Debt                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt, interest rate 6.80%       6.80%          
Total debt principal $ 490 0     $ 387         0
U.S. Dollar Denominated Unsecured Notes | 4.40% due April 15, 2029 | Long-Term Debt                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt, interest rate 4.40%       4.40%          
Total debt principal $ 951 0     $ 750         0
U.S. Dollar Denominated Unsecured Notes | 3.95% due April 15, 2022 | Long-Term Debt                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt, interest rate           3.95%        
U.S. Dollar Denominated Unsecured Notes | 4.00% due April 15, 2024 | Long-Term Debt                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt, interest rate 4.00%     4.00% 4.00% 4.00%        
Total debt principal $ 341 $ 0     $ 269         $ 0
U.S. Dollar Denominated Unsecured Notes | The Arrangement                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt, fair value               3,400    
Long-Term Debt               $ 3,000 $ 2,400  
Senior Unsecured Notes                    
Disclosure of detailed information about borrowings [line items]                    
Long-Term Debt             $ 1,250      
Senior unsecured notes, 2.65%, maturing January 15, 2032                    
Disclosure of detailed information about borrowings [line items]                    
Long-Term Debt             $ 500      
Long-term debt, interest rate             2.65%      
Senior unsecured notes, 3.75%, maturing February 15, 2052                    
Disclosure of detailed information about borrowings [line items]                    
Long-Term Debt             $ 750      
Long-term debt, interest rate             3.75%      
Unsecured notes, 3.95%, maturing 2022                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt, interest rate           3.95%        
Principal amount of debt repayments           $ 500        
Unsecured notes, 3.00%, maturing 2022                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt, interest rate           3.00%        
Principal amount of debt repayments           $ 500        
Unsecured notes, 3.80%, maturing 2023                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt, interest rate           3.80%        
Principal amount of debt repayments           $ 335        
Unsecured notes, 4.00%, maturing 2024                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt, interest rate           4.00%        
Principal amount of debt repayments           $ 481        
Unsecured notes, 5.38%, maturing 2025                    
Disclosure of detailed information about borrowings [line items]                    
Long-term debt, interest rate           5.38%        
Principal amount of debt repayments           $ 334