Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
NSP-Minnesota
Operating expenses [Abstract]
Other Receivables	$ 4	$ 3
Accounts Payable, Other	0	0
PSCo
Operating expenses [Abstract]
Other Receivables	11	11
Accounts Payable, Other	0	0
Other Subsidiaries of Xcel Energy Inc.
Operating expenses [Abstract]
Other Receivables	11	1
Accounts Payable, Other	7	23
Xcel Energy [Member]
Operating expenses [Abstract]
Other Receivables	26	15
Accounts Payable, Other	7	23
Other Expense [Member]
Operating expenses [Abstract]
Costs and Expenses, Related Party	245	238	$ 209
Interest Expense
Operating expenses [Abstract]
Costs and Expenses, Related Party	$ 4	$ 1	$ 0