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Fair Value of Financial Assets and Liabilities - Fair Value Assets and Liabilities Measure on a Recurring Basis Gain Loss Included in Earnings (Details) - Level 3 - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Fair Value Assets and Liabilities Measured on a Recurring Basis Gain Loss Included in Earnings [Line Items] |  |  |  |
Total (losses) gains included in net income | $ 62 | $ (236) | $ (429) | $ 25
Total unrealized (losses) gains | 195 | 54 | 220 | 760
Operating revenues |  |  |  |
Fair Value Assets and Liabilities Measured on a Recurring Basis Gain Loss Included in Earnings [Line Items] |  |  |  |
Total (losses) gains included in net income | 177 | (129) | (97) | 388
Total unrealized (losses) gains | 300 | 97 | 561 | 1,144
Purchased power and fuel |  |  |  |
Fair Value Assets and Liabilities Measured on a Recurring Basis Gain Loss Included in Earnings [Line Items] |  |  |  |
Total (losses) gains included in net income | (119) | (75) | (338) | (332)
Total unrealized (losses) gains | (109) | (43) | (345) | (385)
Other, net |  |  |  |
Fair Value Assets and Liabilities Measured on a Recurring Basis Gain Loss Included in Earnings [Line Items] |  |  |  |
Total (losses) gains included in net income | 4 | 0 | 4 | 1
Total unrealized (losses) gains | $ 0 | $ 0 | $ 0 | $ 1

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