Commitments and Contingencies - Sherco (Details) - USD ($) $ in Millions	1 Months Ended
	Jan. 31, 2021	Sep. 22, 2023
Rate Matters [Abstract]
Customer refund of previously recovered purchased power costs	$ 17
Amount MPUC previously disallowed related to Sherco outage	$ 22
NSP Minnesota [Member]
Public Utilities, General Disclosures [Line Items]
DOC Recommendation Based on Xcel's GE Litigation Loss of Use		$ 56