Borrowings and Other Financing Instruments Amended Credit Agreements (Details) - Revolving Credit Facility [Member] - USD ($) $ in Millions	Dec. 31, 2022		Dec. 31, 2021
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 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	700	[1]	500
Xcel Energy Inc.
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,500	[1]	$ 1,250

[1] These credit facilities mature in September 2027.