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Hedging Activities and Fair Value Measurements, Gains and Losses on Derivative Instruments and Related Hedged Items (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Derivatives in fair value hedging relationships [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income on Derivative $ 0 $ 0 $ 1 $ 4
Gain (Loss) Recognized in Income on Hedged Item 1 3 5 2
Derivatives in fair value hedging relationships [Member] | Commodity derivatives [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income on Derivative $ 0 $ 0 $ 1 $ 4
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Revenues Revenues Revenues Revenues
Derivatives in fair value hedging relationships [Member] | Commodity derivatives [Member] | Revenue [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income on Hedged Item $ 1 $ 3 $ 5 $ 2
Derivatives in cash flow hedging relationships [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in Value Recognized in Other Comprehensive Income (Loss) on Derivative 79 46 (81) (48)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income 46 19 50 49
Derivatives in cash flow hedging relationships [Member] | Interest rate derivatives [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in Value Recognized in Other Comprehensive Income (Loss) on Derivative 0 0 2 (5)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income $ 1 $ 3 $ 3 $ 1
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration] Interest expense Interest expense Interest expense Interest expense
Accumulated other comprehensive income related to interest rate derivative instruments expected to be reclassified to earnings in interest expense over the next twelve months $ 6   $ 6  
Derivatives in cash flow hedging relationships [Member] | Commodity derivatives [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Net accumulated other comprehensive income (loss) related to commodity derivative instruments expected to be reclassified to earnings over the next twelve months 20   20  
Accumulated other comprehensive income (loss) related to commodity derivative instruments expected to be reclassified to revenue over the next twelve months 3   3  
Accumulated other comprehensive income (loss) related to commodity derivative instruments expected to be reclassified to operating costs and expenses over the next twelve months 17   17  
Derivatives in cash flow hedging relationships [Member] | Commodity derivatives [Member] | Revenue [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in Value Recognized in Other Comprehensive Income (Loss) on Derivative [1] 74 $ 34 (75) $ (31)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income 61 27 80 51
Derivatives in cash flow hedging relationships [Member] | Commodity derivatives [Member] | Operating costs and expenses [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in Value Recognized in Other Comprehensive Income (Loss) on Derivative [1] 5 12 (8) (12)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income (16) (11) (33) (3)
Derivatives not designated as hedging instruments [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income on Derivative (5) 17 7 217
Derivatives not designated as hedging instruments [Member] | Commodity derivatives [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Realized gains     3  
Unrealized gains     4  
Derivatives not designated as hedging instruments [Member] | Commodity derivatives [Member] | Revenue [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income on Derivative (5) 17 8 217
Derivatives not designated as hedging instruments [Member] | Commodity derivatives [Member] | Operating costs and expenses [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income on Derivative $ 0 $ 0 $ (1) $ 0
[1] The fair value of these derivative instruments will be reclassified to their respective locations on the Unaudited Condensed Statement of Consolidated Operations when the forecasted transactions affect earnings.