Compensation Related Costs, Postemployment Benefits (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) Employees
Xcel Energy [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Other Postretirement Benefits Cost (Reversal of Cost) | $	$ 72
Xcel Energy [Member] | Voluntary Retirement Program
Postemployment Benefits [Abstract]
Entity Number of Employees	400
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Entity Number of Employees	400
Xcel Energy [Member] | Employee Severance
Postemployment Benefits [Abstract]
Entity Number of Employees	150
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Entity Number of Employees	150
SPS [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Other Postretirement Benefits Cost (Reversal of Cost) | $	$ 9