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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
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Income on Derivatives | $ 48 | $ (20)
Natural gas | Operating Revenues — Non-utility operations |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Income on Derivatives | 94 | (69)
Natural gas | Fuel, purchased power, gas, and other — non-utility |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Income on Derivatives | (100) | 59
Electricity | Operating Revenues — Non-utility operations |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Income on Derivatives | 45 | (5)
Environmental & Other | Operating Revenues — Non-utility operations |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Income on Derivatives | 9 | (7)
Foreign currency exchange contracts | Operating Revenues — Non-utility operations |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Income on Derivatives | $ 0 | $ 2

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