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Borrowings and Other Financing Instruments Equity through DRIP and Benefits Program (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Forward Contract Indexed to Issuer's Equity [Line Items] |  |
Proceeds from issuance of common stock | $ 8 | $ 6
Issuances of common stock | 12 | 18
Dividend Reinvestment Program |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |
Proceeds from issuance of common stock | $ 17 | $ 15

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