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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 | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivatives | $ 347 | $ 383 | $ (106)
Natural gas | Operating Revenues — Non-utility operations |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivatives | (169) | 153 | (235)
Natural gas | Fuel, purchased power, gas, and other — non-utility |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivatives | 233 | 122 | (108)
Electricity | Operating Revenues — Non-utility operations |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivatives | 266 | 105 | 221
Environmental & Other | Operating Revenues — Non-utility operations |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivatives | 14 | 5 | 13
Foreign currency exchange contracts | Operating Revenues — Non-utility operations |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivatives | $ 3 | $ (2) | $ 3

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