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Borrowings and Other Financing Instruments Equity through DRIP and Benefits Program (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |
Proceeds from issuance of common stock |  |  | $ 101 | $ 75
Issuances of common stock | $ 101 | $ 77 | 113 | 95
Dividend Reinvestment Program |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |
Proceeds from issuance of common stock |  |  | $ 40 | $ 61

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