Commitments and Contingencies NSP-Minnesota-Sherco (Details) - USD ($) $ in Millions	1 Months Ended
	Jan. 31, 2021	Sep. 22, 2023
Rate Matters [Abstract]
Sherco Dissallowance	$ 22
NSP-Minnesota
Rate Matters [Abstract]
Customer refund of previously recovered purchased power costs	$ 17
DOC Recommendation Based on Xcel's GE Litigation Loss of Use		$ 56