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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (Loss) Recognized in Income on Derivatives | $ 53 | $ (63) | $ 156 | $ (233)
Natural gas | Operating Revenues — Non-utility operations |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (Loss) Recognized in Income on Derivatives | 59 | (32) | 130 | (263)
Natural gas | Fuel, purchased power, gas, and other — non-utility |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (Loss) Recognized in Income on Derivatives | (65) | (165) | 83 | (100)
Electricity | Operating Revenues — Non-utility operations |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (Loss) Recognized in Income on Derivatives | 60 | 110 | (55) | 112
Environmental & Other | Operating Revenues — Non-utility operations |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (Loss) Recognized in Income on Derivatives | 0 | 22 | (1) | 18
Foreign currency exchange contracts | Operating Revenues — Non-utility operations |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (Loss) Recognized in Income on Derivatives | $ (1) | $ 2 | $ (1) | $ 0

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