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Financial Instruments and Risk Management (Narrative) (Details)
 12 Months Ended
Dec. 31, 2025
USD ($)
Contract
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Derivative [Line Items]      
Realized foreign exchange gain (loss) $ 68,000,000 $ 268,000,000 $ (50,000,000)
Unrealized gain (loss) on derivatives 95,000,000 $ (236,000,000) 215,000,000
Credit risk, financial instrument, maximum exposure, based on gross fair value basis 91,000,000    
Credit risk, financial instrument, maximum exposure, based on net fair value basis $ 90,000,000    
Number of credit risk derivatives held | Contract 0    
Collateral balances $ 0    
Concentration risk, percentage 94.00% 94.00%  
Revenue [Member]      
Derivative [Line Items]      
Realized foreign exchange gain (loss) $ 166,000,000 $ 271,000,000 (43,000,000)
Unrealized gain (loss) on derivatives 172,000,000 135,000,000 151,000,000
Foreign Currency Gain (Loss) [Member]      
Derivative [Line Items]      
Realized foreign exchange gain (loss) (98,000,000) (3,000,000) (8,000,000)
Unrealized gain (loss) on derivatives 89,000,000 (100,000,000) 21,000,000
Other Derivative Contracts [Member] | Revenue [Member]      
Derivative [Line Items]      
Realized foreign exchange gain (loss) 0 $ 4,000,000 $ 1,000,000
Montney Acquisition [Member] | Currency Swaps Maturing June 30, 2025 [Member] | Foreign Currency Gain (Loss) [Member]      
Derivative [Line Items]      
Realized foreign exchange gain (loss) $ (97,000,000)