Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
NSP-Minnesota
Operating expenses [Abstract]
Other Receivables	$ 1	$ 2
Accounts Payable, Other	0	0
PSCo
Operating expenses [Abstract]
Other Receivables	6	8
Accounts Payable, Other	0	0
Other Subsidiaries of Xcel Energy Inc.
Operating expenses [Abstract]
Other Receivables	18	10
Accounts Payable, Other	46	27
Xcel Energy [Member]
Operating expenses [Abstract]
Other Receivables	25	20
Accounts Payable, Other	46	27
Other Expense [Member]
Operating expenses [Abstract]
Costs and Expenses, Related Party	280	244	$ 245
Interest Expense
Operating expenses [Abstract]
Costs and Expenses, Related Party	$ 4	$ 3	$ 4