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Segmented Information (Goodwill, Property, Plant and Equipment and Total Assets by Geographic Region) (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting, Asset Reconciling Item [Line Items]      
Goodwill $ 2,576 $ 2,546  
Property, Plant and Equipment 14,244 14,364  
Total Assets 20,390 19,254  
United States [Member]      
Segment Reporting, Asset Reconciling Item [Line Items]      
Goodwill 1,938 1,938 $ 1,938
Property, Plant and Equipment 11,635 13,302  
Total Assets 14,517 16,320  
Canada [Member]      
Segment Reporting, Asset Reconciling Item [Line Items]      
Goodwill 638 608 $ 661
Property, Plant and Equipment 2,609 1,062  
Total Assets $ 5,873 $ 2,934