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Financial and Other Derivative Instruments (Effect of Derivatives Not Designated as Hedging Instruments) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total | $ 130 | $ 112 | $ 247 | $ 214
Natural gas | Operating Revenues — Non-utility operations |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total | (18) | (25) | 66 | (49)
Natural gas | Fuel, purchased power, gas, and other — non-utility |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total | 48 | 45 | (98) | 83
Electricity | Operating Revenues — Non-utility operations |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total | 90 | 99 | 246 | 189
Environmental & Other | Operating Revenues — Non-utility operations |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total | 11 | (6) | 34 | (10)
Foreign currency exchange contracts | Operating Revenues — Non-utility operations |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total | $ (1) | $ (1) | $ (1) | $ 1

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