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Borrowings and Other Financing Instruments Borrowings and Other Financing Instruments, Credit Facilities (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Credit Facilities |  |  |
Line of Credit Facility [Line Items] |  |  |
Credit Facility |  | $ 3,250,000,000 |
Drawn | [1] | 1,087,000,000 |
Available |  | $ 2,163,000,000 |
Xcel Energy Inc. | Credit Facilities |  |  |
Line of Credit Facility [Line Items] |  |  |
Line Of Credit Facility Debt To Total Capitalization Ratio (as a percent) | [2],[3] | 58.00% | 58.00%
Credit Facility | [4] | $ 1,500,000,000 |
Drawn | [1] | 488,000,000 |
Available |  | 1,012,000,000 |
Line Of Credit Facility Maximum Amount Credit Facility May Be Increased | [3] | $ 200,000,000 |
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 |  | $ 75,000,000 |
Number Of Additional Periods Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval | [3],[5] | 2 |
Term Of Each Additional Period Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval |  | 1 year |
Debt Instrument, Maturity Date |  | Jun. 30, 2021 |
Direct advances on the credit facility outstanding |  |  | $ 0
Xcel Energy Inc. | 364-Day Term Loan |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of Credit Facility, Expiration Period |  | 364 days |
NSP-Minnesota | Credit Facilities |  |  |
Line of Credit Facility [Line Items] |  |  |
Line Of Credit Facility Debt To Total Capitalization Ratio (as a percent) | [2] | 48.00% | 48.00%
Credit Facility | [4] | $ 500,000,000 |
Drawn | [1] | 187,000,000 |
Available |  | 313,000,000 |
Line Of Credit Facility Maximum Amount Credit Facility May Be Increased |  | $ 100,000,000 |
Line Of Credit Facility Maximum Debt To Total Capitalization Ratio Allowed |  | 65.00% |
Number Of Additional Periods Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval | [5] | 2 |
Term Of Each Additional Period Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval |  | 1 year |
Direct advances on the credit facility outstanding |  | $ 0 | $ 0
PSCo | Credit Facilities |  |  |
Line of Credit Facility [Line Items] |  |  |
Line Of Credit Facility Debt To Total Capitalization Ratio (as a percent) | [2] | 46.00% | 44.00%
Credit Facility | [4] | $ 700,000,000 |
Drawn | [1] | 317,000,000 |
Available |  | 383,000,000 |
Line Of Credit Facility Maximum Amount Credit Facility May Be Increased |  | $ 100,000,000 |
Line Of Credit Facility Maximum Debt To Total Capitalization Ratio Allowed |  | 65.00% |
Number Of Additional Periods Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval | [5] | 2 |
Term Of Each Additional Period Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval |  | 1 year |
Direct advances on the credit facility outstanding |  | $ 0 | $ 0
SPS | Credit Facilities |  |  |
Line of Credit Facility [Line Items] |  |  |
Line Of Credit Facility Debt To Total Capitalization Ratio (as a percent) | [2] | 46.00% | 46.00%
Credit Facility | [4] | $ 400,000,000 |
Drawn | [1] | 44,000,000 |
Available |  | 356,000,000 |
Line Of Credit Facility Maximum Amount Credit Facility May Be Increased |  | $ 50,000,000 |
Line Of Credit Facility Maximum Debt To Total Capitalization Ratio Allowed |  | 65.00% |
Number Of Additional Periods Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval | [5] | 2 |
Term Of Each Additional Period Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval |  | 1 year |
Direct advances on the credit facility outstanding |  | $ 0 | $ 0
NSP-Wisconsin | Credit Facilities |  |  |
Line of Credit Facility [Line Items] |  |  |
Line Of Credit Facility Debt To Total Capitalization Ratio (as a percent) | [2] | 48.00% | 47.00%
Credit Facility | [4] | $ 150,000,000 |
Drawn | [1] | 51,000,000 |
Available |  | $ 99,000,000 |
Line Of Credit Facility Maximum Debt To Total Capitalization Ratio Allowed |  | 65.00% |
Number Of Additional Periods Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval | [5] | 1 |
Term Of Each Additional Period Revolving Termination Date Can Be Extended Subject To Majority Bank Group Approval |  | 1 year |
Direct advances on the credit facility outstanding |  | $ 0 | $ 0
[1] | Includes outstanding commercial paper, term loan borrowings and letters of credit.
[2] | Each credit facility has a financial covenant requiring that the debt-to-total capitalization ratio be less than or equal to 65%.
[3] | The Xcel Energy Inc. credit facility has a cross-default provision that Xcel Energy Inc. will 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.
[4] | These credit facilities mature in June 2021, with the exception of Xcel Energy’s Inc.’s 364-day term loan agreement which expires in December 2019.
[5] | 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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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X
- Definition Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The debt-to-total capitalization ratio for each entity as of the end of the period pursuant to the related financial covenants included in each credit facility agreement. + References No definition available. + Details
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- Definition The maximum amount the credit facility may be increased. + References No definition available. + Details
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- Definition The maximum debt-to-total capitalization ratio allowed pursuant to the related financial covenants included in each credit facility agreement. + References No definition available. + Details
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- Definition The minimum amount of default on certain indebtedness to initiate cross default provisions of the credit facility agreement. + References No definition available. + Details
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- Definition The credit facility has a cross default provision that provides the borrower will be in default on its borrowings under the facility if certain subsidiaries, comprising a minimum percentage of consolidated assets, defaults on certain indebtedness greater than a stated amount. + References No definition available. + Details
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- Definition Number of additional periods the revolving termination date on the credit facility can be extended, subject to majority bank group approval. + References No definition available. + Details
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