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Derivative Instruments - Narrative (Details) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 USD ($) tbtu | Dec. 31, 2024 USD ($) tbtu
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative, Nonmonetary Notional Amount | tbtu | 5,283 | 5,500
Derivative, collateral not netted | $ | $ 14 | $ 13
Maximum [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative, Term of Contract | 15 years |

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