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Borrowings and Other Financing Instruments Forward Equity Agreement (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Forward Contract Indexed to Issuer's Equity [Line Items] |  |
Proceeds from issuance of common stock | $ 6 | $ 1
Issuances of common stock | 18 | 12
Dividend Reinvestment Program |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |
Proceeds from issuance of common stock | $ 15 | $ 10

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