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Borrowings and Other Financing Instruments Credit Facilities (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Line of Credit Facility [Line Items] |  |  |
Amount outstanding at period end |  | $ 785 | $ 813
Letter of Credit |  |  |
Line of Credit Facility [Line Items] |  |  |
Amount outstanding at period end |  | 44 | 43
Revolving Credit Facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | [1] | 3,550 |
Drawn | [2] | 829 |
Available |  | 2,721 |
Direct advances on the credit facility outstanding |  | $ 0 | 0
Parent [Member] | Revolving Credit Facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Line Of Credit Facility Maximum Debt To Total Capitalization Ratio Allowed |  | 65.00% |
Line Of Credit Facility Minimum Threshhold Percentage Of Subsidiary Assets To Consolidated Assets Required To Initiate Cross Default Provisions |  | 15.00% |
Line of Credit Facility, Minimum Amount of Indebtedness in Default to Initiate Cross Default Provisions |  | $ 75 |
Xcel Energy Inc. |  |  |
Line of Credit Facility [Line Items] |  |  |
Amount outstanding at period end |  | 165 | $ 231
Xcel Energy Inc. | Revolving Credit Facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | [1] | 1,500 |
Drawn | [2] | 165 |
Available |  | $ 1,335 |
Xcel Energy Inc. | Revolving Credit Facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Line Of Credit Facility Debt To Total Capitalization Ratio (as a percent) | [3],[4] | 59.80% | 59.70%
Line Of Credit Facility Maximum Amount Credit Facility May Be Increased | [4],[5] | $ 350 |
Number Of Additional Periods Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval | [4],[6] | 2 |
NSP-Wisconsin | Revolving Credit Facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Line Of Credit Facility Debt To Total Capitalization Ratio (as a percent) | [3] | 48.20% | 47.40%
Number Of Additional Periods Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval | [6] | 1 |
Line of Credit Facility, Maximum Borrowing Capacity | [1] | $ 150 |
Drawn | [2] | 60 |
Available |  | $ 90 |
NSP Minnesota | Revolving Credit Facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Line Of Credit Facility Debt To Total Capitalization Ratio (as a percent) | [3] | 47.70% | 47.70%
Line Of Credit Facility Maximum Amount Credit Facility May Be Increased | [5] | $ 150 |
Number Of Additional Periods Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval | [6] | 2 |
Line of Credit Facility, Maximum Borrowing Capacity | [1] | $ 700 |
Drawn | [2] | 180 |
Available |  | $ 520 |
SPS | Revolving Credit Facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Line Of Credit Facility Debt To Total Capitalization Ratio (as a percent) | [3] | 46.10% | 45.70%
Line Of Credit Facility Maximum Amount Credit Facility May Be Increased | [5] | $ 50 |
Number Of Additional Periods Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval | [6] | 2 |
Line of Credit Facility, Maximum Borrowing Capacity | [1] | $ 500 |
Drawn | [2] | 75 |
Available |  | $ 425 |
PSCo | Revolving Credit Facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Line Of Credit Facility Debt To Total Capitalization Ratio (as a percent) | [3] | 44.80% | 44.00%
Line Of Credit Facility Maximum Amount Credit Facility May Be Increased | [5] | $ 100 |
Number Of Additional Periods Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval | [6] | 2 |
Line of Credit Facility, Maximum Borrowing Capacity | [1] | $ 700 |
Drawn | [2] | 349 |
Available |  | $ 351 |
[1] | These credit facilities mature in September 2027.
[2] | Includes outstanding commercial paper and letters of credit.
[3] | Each credit facility has a financial covenant requiring that the debt-to-total capitalization ratio be less than or equal to 65%.
[4] | The Xcel Energy Inc. credit facility has a cross-default provision that Xcel Energy Inc. would be in default on its borrowings under the facility if it or any of its subsidiaries (except NSP-Wisconsin as long as its total assets do not comprise more than 15% of Xcel Energy’s consolidated total assets) default on indebtedness in an aggregate principal amount exceeding $75 million.
[5] | Amounts authorized by state commissions in respective jurisdictions.
[6] | All extension requests are subject to majority bank group approval.

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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