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Borrowings and Other Financing Instruments Equity through DRIP and Benefits Program (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |
Proceeds from issuance of common stock |  |  | $ 83 | $ 156
Issuances of common stock | $ 18 | $ 14 | 113 | 185
Dividend Reinvestment Program |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |
Proceeds from issuance of common stock |  |  | $ 78 | $ 59

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