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Derivative Instruments and Hedging Activities - Schedule of Derivative Gains and Losses (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Interest Rate Contracts (Interest expense) |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Unrealized gain (loss) on derivatives, net of tax | $ 7 | $ 2 | $ 7 | $ (32)
Energy-Related Commodity Contracts (Mark-to-market for economic hedging activities included in Total operating revenues) |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Unrealized gain (loss) on derivatives, net of tax | 5 | (10) | 35 | (21)
Energy-Related Commodity Contracts (Mark-to-market for economic hedging activities included in Cost of operations) |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Unrealized gain (loss) on derivatives, net of tax | $ (1) | $ 0 | $ (1) | $ 0

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