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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 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Derivatives in fair value hedging relationships [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income on Derivative $ 8 $ (50) $ (116) $ (237)
Gain (Loss) Recognized in Income on Hedged Item 41 21 66 230
Derivatives in fair value hedging relationships [Member] | Commodity derivatives [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income on Derivative $ 8 $ (50) $ (116) $ (237)
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 $ 41 $ 21 $ 66 $ 230
Derivatives in cash flow hedging relationships [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Change in Value Recognized in Other Comprehensive Income (Loss) on Derivative 186 (100) 126 (669)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income (10) (127) 39 (662)
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 0 183
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income $ (1) $ (10) $ (15) $ (28)
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 loss related to interest rate derivative instruments expected to be reclassified to earnings in interest expense over the next twelve months $ (4)   $ (4)  
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 246   246  
Accumulated other comprehensive income (loss) related to commodity derivative instruments expected to be reclassified to revenue over the next twelve months 250   250  
Accumulated other comprehensive income (loss) related to commodity derivative instruments expected to be reclassified to operating costs and expenses over the next twelve months (4)   (4)  
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] 176 $ (110) 78 $ (843)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income (35) (117) 12 (615)
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] 10 10 48 (9)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income 26 0 42 (19)
Derivatives not designated as hedging instruments [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income on Derivative 39 109 91 145
Derivatives not designated as hedging instruments [Member] | Commodity derivatives [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Realized gains     107  
Unrealized gains (losses)     (16)  
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 32 108 77 144
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 $ 7 $ 1 $ 14 $ 1
[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.