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Borrowings and Other Financing Instruments Forward Equity Agreement (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |
Proceeds from issuance of common stock |  |  | $ 156 | $ 13
Issuances of common stock | $ 14 | $ 10 | 185 | 40
Dividend Reinvestment Program |  |  |  |
Forward Contract Indexed to Issuer's Equity [Line Items] |  |  |  |
Proceeds from issuance of common stock |  |  | $ 34 | $ 38

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