v3.26.3
Hedging Activities and Fair Value Measurements - Schedule of Gains and Losses on Derivative Instruments and Related Hedged Items (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Derivatives not designated as hedging instruments        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income on Derivative $ 43 $ (22) $ (1) $ 26
Commodity Derivative Instruments | Location, Statement of Income, Balance [Axis]: us-gaap:OperatingCostsAndExpenses | Derivatives not designated as hedging instruments        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income on Derivative (6) (5) (9) (4)
Commodity Derivative Instruments | Location, Statement of Income, Balance [Axis]: us-gaap:Revenues | Derivatives not designated as hedging instruments        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income on Derivative 49 (17) 8 30
Fair value hedge | Commodity Derivative Instruments        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income on Derivative 1 0 (2) 4
Fair value hedge | Commodity Derivative Instruments | Location, Statement of Income, Balance [Axis]: us-gaap:Revenues        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income on Hedged Item 0 (2) 11 (4)
Cash flow hedge        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in Value Recognized in Other Comprehensive Income (Loss) on Derivative (247) 65 (548) 101
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income (30) 37 (169) 73
Cash flow hedge | Commodity Derivative Instruments | Location, Statement of Income, Balance [Axis]: us-gaap:OperatingCostsAndExpenses        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in Value Recognized in Other Comprehensive Income (Loss) on Derivative (6) (12) (56) (27)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income (9) (12) (30) (32)
Cash flow hedge | Commodity Derivative Instruments | Location, Statement of Income, Balance [Axis]: us-gaap:Revenues        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in Value Recognized in Other Comprehensive Income (Loss) on Derivative (241) 77 (492) 114
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income (22) 47 (144) 100
Cash flow hedge | Interest Rate Derivative Instruments        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in Value Recognized in Other Comprehensive Income (Loss) on Derivative 0 0 0 14
Cash flow hedge | Interest Rate Derivative Instruments | Location, Statement of Income, Balance [Axis]: us-gaap:InterestExpenseNonoperating        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income $ 1 $ 2 $ 5 $ 5