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Borrowings and Other Financing Instruments Other Equity (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Dividend Reinvestment Program [Line Items] |  |  |
Proceeds from Issuance of Common Stock | $ 270 | $ 322 | $ 366
DividendReinvestmentProgram [Member] |  |  |
Dividend Reinvestment Program [Line Items] |  |  |
Proceeds from Issuance of Common Stock | $ 88 | $ 84 |

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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-14 + Details
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- Definition [Line Items] for Dividend Reinvestment Program [Table] + References No definition available. + Details
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- Details
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