Borrowings and Other Financing Instruments Credit Facilities (Details) $ in Millions		12 Months Ended
		Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Line of Credit Facility [Line Items]
Amount outstanding at period end		$ 695	$ 785
Letter of Credit
Line of Credit Facility [Line Items]
Amount outstanding at period end		42	44
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	[1]	3,550
Drawn	[2]	737
Available		2,813
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		235	$ 165
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]	235
Available		$ 1,265
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%	59.80%
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]	47.10%	48.20%
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]	35
Available		$ 115
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]	47.00%	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]	207
Available		$ 493
SPS | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line Of Credit Facility Debt To Total Capitalization Ratio (as a percent)	[3]	46.60%	46.10%
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]	145
Available		$ 355
PSCo | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line Of Credit Facility Debt To Total Capitalization Ratio (as a percent)	[3]	45.20%	44.80%
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]	115
Available		$ 585

[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.