Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Tax Adjustments, Settlements, and Unusual Provisions	$ 13
Income Tax [Line Items]
Federal detriment	23	$ 24
Tax Credit Carryforward [Line Items]
Federal detriment	23	24
Xcel Energy [Member]
Income Tax [Line Items]
Potential Tax Adjustments	0
SPS
Income Tax [Line Items]
Potential Tax Adjustments	0
State and Local Jurisdiction [Member]
Income Tax [Line Items]
Federal Benefit	16	17
Tax Credit Carryforward [Line Items]
Federal Benefit	$ 16	$ 17