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Income Taxes (Summary of Income Taxes Paid (Recovered)) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Income Taxes Paid (Recovered), net:      
Federal $ 17    
State [1] (3)    
Income Taxes Paid (Recovered), net 62 $ 295 $ (19)
Canada Revenue Agency [Member] | Canada [Member]      
Income Taxes Paid (Recovered), net:      
Foreign 36    
Canada Revenue Agency [Member] | Province [Member]      
Income Taxes Paid (Recovered), net:      
Foreign [2] $ 12    
[1] Primarily includes taxes paid to (recovered from) Texas.
[2] Primarily includes taxes paid to (recovered from) Alberta.