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Foreign Exchange (Gain) Loss, Net (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Schedule Of Foreign Exchange Transactions [Line Items]      
Unrealized Foreign Exchange (Gain) Loss $ (43) $ 35 $ (6)
Foreign Exchange (Gain) Loss, Net 31 (19) 19
Translation of U.S. Dollar Financing Debt Issued From Canada [Member]      
Schedule Of Foreign Exchange Transactions [Line Items]      
Foreign Exchange on Settlements 0 (1) (2)
Translation of U.S. Dollar Risk Management Contracts Issued From Canada [Member]      
Schedule Of Foreign Exchange Transactions [Line Items]      
Unrealized Foreign Exchange (Gain) Loss (85) 92 (20)
Foreign Exchange on Settlements 98 3 8
Translation of Intercompany Notes [Member]      
Schedule Of Foreign Exchange Transactions [Line Items]      
Unrealized Foreign Exchange (Gain) Loss 42 (57) 14
Foreign Exchange on Settlements (42) (41) 8
Other Monetary Revaluations [Member]      
Schedule Of Foreign Exchange Transactions [Line Items]      
Foreign Exchange on Settlements $ 18 $ (15) $ 11