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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
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivatives | $ 383 | $ (106) | $ (184)
Natural gas | Operating Revenues — Non-utility operations |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivatives | 153 | (235) | (224)
Natural gas | Fuel, purchased power, gas, and other — non-utility |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivatives | 122 | (108) | (89)
Electricity | Operating Revenues — Non-utility operations |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivatives | 105 | 221 | 169
Environmental & Other | Operating Revenues — Non-utility operations |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivatives | 5 | 13 | (40)
Foreign currency exchange contracts | Operating Revenues — Non-utility operations |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivatives | $ (2) | $ 3 | $ 0

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