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Schedule I, Condensed Financial Statements of Xcel Energy Inc, Notes to Condensed Financial Statements (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Money Pool [Abstract] |  |  |  |
Schedule of Guarantor Obligations |  | Guarantees and bond indemnities issued and outstanding as of Dec. 31, 2018:
(Millions of Dollars) |  | Guarantor |  | Guarantee Amount |  | Current Exposure |  | Triggering Event
Guarantee of the indemnification obligations of Xcel Energy Services Inc. under the aircraft leases (a) |  | Xcel Energy Inc. |  | $ | 11.0 |  |  | $ | — |  |  | (d)
Guarantee of loan for Hiawatha Collegiate High School (b) |  | Xcel Energy Inc. |  | 1.0 |  |  | — |  |  | (d)
Total guarantees issued |  |  |  | 12.0 |  |  | $ | — |  |  |
Guarantee performance and payment of surety bonds for Xcel Energy Inc.’s utility subsidiaries (c) |  | Xcel Energy Inc. |  | $ | 51.1 |  |  | (f) |  | (e)
Guarantor Obligations [Line Items] |  |  |  |
Guarantees issued and outstanding | $ 12.0 | $ 12.0 |  |
Current exposure under these guarantees | 0.0 | 0.0 |  |
Obligations Under Aircraft Leases | Payment or Performance Guarantee |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Guarantees issued and outstanding | 11.0 | 11.0 |  |
Current exposure under these guarantees | 0.0 | 0.0 |  |
Loan for Hiawatha Collegiate High School [Member] | Payment or Performance Guarantee |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Guarantees issued and outstanding | 1.0 | 1.0 |  |
Current exposure under these guarantees | 0.0 | $ 0.0 |  |
Guarantee Expiration Date (year) |  | 2024 |  |
Surety Bonds | Payment or Performance Guarantee |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Guarantees issued and outstanding | 51.1 | $ 51.1 |  |
Minimum | Obligations Under Aircraft Leases | Payment or Performance Guarantee |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Guarantee Expiration Date (year) |  | 2021 |  |
Maximum | Obligations Under Aircraft Leases | Payment or Performance Guarantee |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Guarantee Expiration Date (year) |  | 2023 |  |
Xcel Energy Inc. |  |  |  |
Accounts Receivable and Payable with Affiliates [Abstract] |  |  |  |
Accounts Receivable | 309.0 | $ 309.0 | $ 302.0 |
Accounts Payable | 0.0 | 0.0 | 0.0 |
Dividends [Abstract] |  |  |  |
Cash dividends paid to Xcel Energy by subsidiaries |  | 1,097.0 | 1,063.0 | $ 923.0
Money Pool [Abstract] |  |  |  |
Loan outstanding at period end | 0.0 | 0.0 | 85.0 | 0.0
Average loan outstanding | 59.0 | 71.0 | 38.0 | 66.0
Maximum loan outstanding | $ 172.0 | $ 243.0 | $ 226.0 | $ 211.0
Weighted average interest rate, computed on a daily basis (percentage) | 2.22% | 1.95% | 1.13% | 0.69%
Weighted average interest rate at period end (percentage) |  |  | 1.18% |
Money pool interest income | $ 0.3 | $ 1.4 | $ 0.4 | $ 0.5
Xcel Energy Inc. | NSP-Minnesota |  |  |  |
Accounts Receivable and Payable with Affiliates [Abstract] |  |  |  |
Accounts Receivable | 117.0 | 117.0 | 68.0 |
Accounts Payable | 0.0 | 0.0 | 0.0 |
Xcel Energy Inc. | NSP-Wisconsin |  |  |  |
Accounts Receivable and Payable with Affiliates [Abstract] |  |  |  |
Accounts Receivable | 3.0 | 3.0 | 13.0 |
Accounts Payable | 0.0 | 0.0 | 0.0 |
Xcel Energy Inc. | PSCo |  |  |  |
Accounts Receivable and Payable with Affiliates [Abstract] |  |  |  |
Accounts Receivable | 29.0 | 29.0 | 69.0 |
Accounts Payable | 0.0 | 0.0 | 0.0 |
Xcel Energy Inc. | SPS |  |  |  |
Accounts Receivable and Payable with Affiliates [Abstract] |  |  |  |
Accounts Receivable | 39.0 | 39.0 | 26.0 |
Accounts Payable | 0.0 | 0.0 | 0.0 |
Xcel Energy Inc. | Xcel Energy Services Inc. |  |  |  |
Accounts Receivable and Payable with Affiliates [Abstract] |  |  |  |
Accounts Receivable | 96.0 | 96.0 | 95.0 |
Accounts Payable | 0.0 | 0.0 | 0.0 |
Xcel Energy Inc. | Xcel Energy Ventures Inc. |  |  |  |
Accounts Receivable and Payable with Affiliates [Abstract] |  |  |  |
Accounts Receivable | 13.0 | 13.0 | 14.0 |
Accounts Payable | 0.0 | 0.0 | 0.0 |
Xcel Energy Inc. | Other Subsidiaries |  |  |  |
Accounts Receivable and Payable with Affiliates [Abstract] |  |  |  |
Accounts Receivable | 12.0 | 12.0 | 17.0 |
Accounts Payable | $ 0.0 | $ 0.0 | $ 0.0 |

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