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Borrowings and Other Financing Instruments Term Loan (Details) - USD ($) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Feb. 17, 2021 | Dec. 31, 2020
Short-term Debt [Line Items] |  |  |  |
Amount outstanding at period end | $ 1,747,000,000 |  |  | $ 584,000,000
Proceeds from issuance of common stock | 13,000,000 | $ 5,000,000 |  |
Expiration Period, Line of Credit |  |  | $ 364 |
Letter of Credit |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Amount outstanding at period end | 19,000,000 |  |  | $ 20,000,000
364-Day Term Loan [Member] | Short-term Debt [Member] | Xcel Energy Inc. |  |  |  |
Short-term Debt [Line Items] |  |  |  |
Credit Facility | 1,200,000,000 |  | $ 1,200,000,000 |
Required debt to total capitalization ratio |  |  | 6500.00% |
Amount outstanding at period end | 1,200,000,000 |  |  |
Available | $ 0 |  |  |

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