Borrowings and Other Financing Instruments Amended Credit Agreements (Details) - Revolving Credit Facility [Member] - USD ($) $ in Millions		Dec. 31, 2024	Dec. 31, 2023
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	[1]	$ 3,550
Direct advances on the credit facility outstanding		0	$ 0
NSP Minnesota
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	[1]	700
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.