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Segmented Information (Revenue by Geographic Region) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disaggregation Of Revenue [Line Items]      
Revenues $ 8,663 $ 8,943 $ 10,661
Gains (losses) on risk management, net 172 135 151
Sublease revenues 73 74 71
Total Revenues 8,908 9,152 10,883
Corporate & Other [Member]      
Disaggregation Of Revenue [Line Items]      
Revenues 0 0 0
Gains (losses) on risk management, net 6 (136) 194
Sublease revenues 73 74 71
Total Revenues 79 (62) 265
United States [Member] | Corporate & Other [Member]      
Disaggregation Of Revenue [Line Items]      
Gains (losses) on risk management, net 75 (133) 94
Sublease revenues 8 8 8
Total Revenues 83 (125) 102
Canada [Member] | Corporate & Other [Member]      
Disaggregation Of Revenue [Line Items]      
Gains (losses) on risk management, net (69) (3) 100
Sublease revenues 65 66 63
Total Revenues $ (4) $ 63 $ 163