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Borrowings and Other Financing Instruments Term Loan (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Short-term Debt [Line Items] |  |  |
Amount outstanding at period end | $ 820 |  | $ 695
Proceeds from issuance of common stock | 1,143 | $ 101 |
ATM Net Proceeds | 1,150 |  | 1,100
Letter of Credit |  |  |
Short-term Debt [Line Items] |  |  |
Amount outstanding at period end | $ 42 |  | $ 42

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