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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
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Mar. 31, 2024 | Mar. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Income on Derivatives | $ (20) | $ 103
Natural gas | Operating Revenues — Non-utility operations |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Income on Derivatives | (69) | 71
Natural gas | Fuel, purchased power, gas, and other — non-utility |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Income on Derivatives | 59 | 148
Electricity | Operating Revenues — Non-utility operations |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Income on Derivatives | (5) | (115)
Environmental & Other | Operating Revenues — Non-utility operations |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Income on Derivatives | (7) | (1)
Foreign currency exchange contracts | Operating Revenues — Non-utility operations |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Income on Derivatives | $ 2 | $ 0

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