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Derivatives and Risk Management Activities - Currency Exchange Rate Risk Hedging (Details)
$ in Millions, $ in Billions
3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
$ / $
Sep. 30, 2025
USD ($)
$ / $
Sep. 30, 2025
CAD ($)
$ / $
Dec. 31, 2024
USD ($)
Recurring Fair Value Measures        
Derivatives and Risk Management Activities        
Fair value, asset $ 66 $ 66   $ 24
Foreign currency derivatives        
Derivatives and Risk Management Activities        
Notional amount of derivatives     $ 4.5  
Gains recognized $ 90 $ 41    
Average fixed exchange rate (cad per usd) | $ / $ 1.37 1.37 1.37  
Average exchange rate (cad per usd) | $ / $ 1.38 1.38 1.38  
Foreign currency derivatives | Recurring Fair Value Measures        
Derivatives and Risk Management Activities        
Fair value, asset $ 41 $ 41   $ 0