Borrowings and Other Financing Instruments Letters of Credit (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022		Dec. 31, 2021
Line of Credit Facility [Line Items]
Amount outstanding at period end	$ 813		$ 1,005
Xcel Energy Inc.
Line of Credit Facility [Line Items]
Amount outstanding at period end	$ 231		638
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	$ 3,550
Revolving Credit Facility [Member] | 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.