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Borrowings and Other Financing Instruments Term Loan (Details) - USD ($) | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Mar. 23, 2020 | Dec. 31, 2019 | Dec. 20, 2019
Short-term Debt [Line Items] |  |  |  |  |
Amount outstanding at period end | $ 500,000,000 |  |  | $ 595,000,000 |
Proceeds from issuance of common stock | 5,000,000 | $ 457,000,000 |  |  |
Expiration Period, Line of Credit |  |  | $ 364 |  | $ 364
364-Day Term Loan [Member] | Short-term Debt [Member] | Xcel Energy Inc. |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Credit Facility | 500,000,000 |  | $ 700,000,000 |  | $ 500,000,000
Required debt to total capitalization ratio |  |  | 65.00% |  |
Basis points |  |  | 50.0 |  |
Amount outstanding at period end | 500,000,000 |  |  |  |
Available | $ 0 |  |  |  |

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