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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, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Derivatives in fair value hedging relationships [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain (Loss) Recognized in Income on Derivative |  | $ 1 | $ 1 | $ 2 | $ 5
Gain (Loss) Recognized in Income on Hedged Item |  | 0 | (7) | 5 | (5)
Derivatives in fair value hedging relationships [Member] | Commodity derivatives [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain (Loss) Recognized in Income on Derivative |  | $ 1 | $ 1 | $ 2 | $ 5
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 |  | $ 0 | $ (7) | $ 5 | $ (5)
Derivatives in cash flow hedging relationships [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Change in Value Recognized in Other Comprehensive Income (Loss) on Derivative |  | 206 | (96) | 125 | (144)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income |  | 79 | (31) | 129 | 18
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 |  | (4) | 0 | (2) | (5)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income |  | $ 2 | $ 2 | $ 5 | $ 3
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 |  | 125 |  | 125 |
Accumulated other comprehensive income (loss) related to commodity derivative instruments expected to be reclassified to revenue over the next twelve months |  | 139 |  | 139 |
Accumulated other comprehensive income (loss) related to commodity derivative instruments expected to be reclassified to operating costs and expenses over the next twelve months |  | (14) |  | (14) |
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] | 261 | $ (129) | 186 | $ (160)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income |  | 96 | (58) | 176 | (7)
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] | (51) | 33 | (59) | 21
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income |  | (19) | 25 | (52) | 22
Derivatives not designated as hedging instruments [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain (Loss) Recognized in Income on Derivative |  | (17) | (27) | (10) | 190
Derivatives not designated as hedging instruments [Member] | Commodity derivatives [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Realized losses |  |  |  | (16) |
Unrealized gains |  |  |  | 6 |
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 |  | (13) | (27) | (5) | 190
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 |  | $ (4) | $ 0 | $ (5) | $ 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.

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- Definition The estimated net amount of unrealized gains or losses on price risk cash flow hedges as of the balance sheet date expected to be reclassified to earnings (operating costs and expenses) within the next twelve months. + References No definition available. + Details
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