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Segmented Information (Goodwill, Property, Plant and Equipment and Total Assets by Segment) (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
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
Operating Segments [Member] | USA Operations [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Goodwill 1,938 1,938
Property, Plant and Equipment 11,613 13,263
Total Assets 14,393 16,233
Operating Segments [Member] | Canadian Operations [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Goodwill 638 608
Property, Plant and Equipment 2,522 970
Total Assets 3,921 1,917
Corporate & Other [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Goodwill 0 0
Property, Plant and Equipment 109 131
Total Assets $ 2,076 $ 1,104