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COASTAL GASLINK - Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jul. 28, 2022
CAD ($)
Dec. 31, 2022
CAD ($)
Year
Dec. 31, 2022
CAD ($)
Year
Dec. 31, 2022
CAD ($)
Year
Dec. 31, 2021
CAD ($)
Dec. 31, 2020
CAD ($)
Feb. 01, 2023
CAD ($)
Jul. 31, 2022
May 31, 2020
Equity Investments                  
Contributions to equity investments       $ 3,433 $ 1,210 $ 765      
Impairment of equity investment (Notes 7 and 11)       3,048 0 0      
Equity investments   $ 9,535 $ 9,535 9,535 8,441        
Coastal GasLink                  
Equity Investments                  
Contributions to equity investments $ 1,900                
Additional aggregate cost   $ 3,300 $ 3,300 $ 3,300 3,300        
Coastal GasLink | Expected term | Discounted cash flow                  
Equity Investments                  
Equity method investments, measurement input | Year   40 40 40          
Coastal GasLink | Accounts payable and other                  
Equity Investments                  
Contributions to equity investments   $ 500              
Coastal GasLink | Subordinated Loan Agreement | Subordinated debt                  
Equity Investments                  
Due from affiliates   250 $ 250 $ 250 238        
Carrying value   0 0 0          
Coastal GasLink | Coastal GasLink | Subordinated Loan Agreement | Subordinated debt                  
Equity Investments                  
Revolving credit facility, borrowing capacity   1,262 1,262 1,262          
Coastal GasLink | Subsequent event                  
Equity Investments                  
Additional aggregate cost             $ 3,300    
Coastal GasLink | Canadian Natural Gas Pipelines                  
Equity Investments                  
Impairment of equity investment (Notes 7 and 11)     3,048            
Impairment charges after tax     2,643            
Equity investments   $ 2,798 $ 2,798 2,798          
Coastal GasLink                  
Equity Investments                  
Contributions to equity investments       $ 1,414 92 $ 101      
Ownership interest percentage           35.00%      
Coastal GasLink | Canadian Natural Gas Pipelines                  
Equity Investments                  
Ownership interest percentage   35.00% 35.00% 35.00%       35.00% 35.00%
Equity investments   $ 0 $ 0 $ 0 $ 386        
Coastal GasLink | Canadian Natural Gas Pipelines | Subsequent event                  
Equity Investments                  
Expected cost of pipeline project             $ 14,500