Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
NSP-Minnesota
Operating expenses [Abstract]
Other Receivables	$ 2	$ 4
Accounts Payable, Other	0	0
PSCo
Operating expenses [Abstract]
Other Receivables	8	11
Accounts Payable, Other	0	0
Other Subsidiaries of Xcel Energy Inc.
Operating expenses [Abstract]
Other Receivables	10	11
Accounts Payable, Other	27	7
Xcel Energy [Member]
Operating expenses [Abstract]
Other Receivables	20	26
Accounts Payable, Other	27	7
Other Expense [Member]
Operating expenses [Abstract]
Costs and Expenses, Related Party	244	245	$ 238
Interest Expense
Operating expenses [Abstract]
Costs and Expenses, Related Party	$ 3	$ 4	$ 1