Borrowings and Other Financing Instruments Letters of Credit (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023
Line of Credit Facility [Line Items]
Amount outstanding at period end		$ 695	$ 785
Xcel Energy Inc.
Line of Credit Facility [Line Items]
Amount outstanding at period end		$ 235	$ 165
Letter of Credit
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Period		1 year
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	[1]	$ 3,550
Revolving Credit Facility [Member] | Xcel Energy Inc.
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	[1]	$ 1,500

[1] These credit facilities mature in September 2027.