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Financial and Other Derivative Instruments (Effect of Derivatives not Designated as Hedging Instruments on the Consolidated Statement of Operations) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (Loss) Recognized in Income on Derivatives | $ 78 | $ 119 | $ 234 | $ (114)
Natural gas | Operating Revenues — Non-utility operations |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (Loss) Recognized in Income on Derivatives | (41) | (52) | 89 | (315)
Natural gas | Fuel, purchased power, gas, and other — non-utility |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (Loss) Recognized in Income on Derivatives | 37 | 108 | 120 | 8
Electricity | Operating Revenues — Non-utility operations |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (Loss) Recognized in Income on Derivatives | 85 | 61 | 30 | 173
Environmental & Other | Operating Revenues — Non-utility operations |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (Loss) Recognized in Income on Derivatives | (4) | (3) | (5) | 15
Foreign currency exchange contracts | Operating Revenues — Non-utility operations |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (Loss) Recognized in Income on Derivatives | $ 1 | $ 5 | $ 0 | $ 5

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