Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating expenses [Abstract]
Interest expense	$ 1	$ 0	$ 0
Accounts Receivable and Payable with Affiliates [Abstract]
Accounts receivable	15	9
Accounts payable	23	16
NSP-Minnesota
Accounts Receivable and Payable with Affiliates [Abstract]
Accounts receivable	3	2
Accounts payable	0	0
PSCo
Accounts Receivable and Payable with Affiliates [Abstract]
Accounts receivable	11	7
Accounts payable	0	0
Other Subsidiaries of Xcel Energy Inc.
Accounts Receivable and Payable with Affiliates [Abstract]
Accounts receivable	1	0
Accounts payable	23	16
Other Expense [Member]
Operating expenses [Abstract]
Costs and Expenses, Related Party	$ 238	$ 209	$ 200