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Borrowings and Other Financing Instruments Term Loan (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Short-term Debt [Line Items] |  |  |
Amount outstanding at period end | $ 1,330 |  | $ 695
Proceeds from issuance of common stock | 1,151 | $ 1,109 |
ATM Net Proceeds | 1,160 |  | 1,100
Letter of Credit |  |  |
Short-term Debt [Line Items] |  |  |
Amount outstanding at period end | $ 74 |  | $ 42

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