Projected Benefit Payments (Details) - USD ($) $ in Millions		1 Months Ended	12 Months Ended
		Jan. 31, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan, Net Projected Benefit Payments [Abstract]
Defined Contribution Plan, Administrative Expense				$ 4	$ 3	$ 3
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation				383	395
Defined Benefit Plan, Gross Projected Benefit Payments [Abstract]
2025				30
2026				30
2027				32
2028				32
2029				32
2030-2034				158
Pension Plan [Member] | Xcel Energy [Member]
Defined Benefit Plan, Net Projected Benefit Payments [Abstract]
Payment for Pension Benefits				100	50	50
Pension Plan [Member] | Xcel Energy [Member] | Subsequent Event
Defined Benefit Plan, Net Projected Benefit Payments [Abstract]
Payment for Pension Benefits		$ 125
Pension Plan [Member] | SPS [Member]
Defined Benefit Plan, Net Projected Benefit Payments [Abstract]
Payment for Pension Benefits				3		0
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Net Projected Benefit Payments [Abstract]
2025	[1]			2
2026	[1]			2
2027	[1]			2
2028	[1]			2
2029	[1]			2
2030-2034	[1]			10
Defined Benefit Plan, Overfunded Plan [Member] | Xcel Energy [Member]
Defined Benefit Plan, Net Projected Benefit Payments [Abstract]
Payment for Pension Benefits				$ 11	$ 11	$ 13
Defined Benefit Plan, Overfunded Plan [Member] | Xcel Energy [Member] | Subsequent Event
Defined Benefit Plan, Net Projected Benefit Payments [Abstract]
Payment for Pension Benefits			$ 8

[1] Amount is reported net of expected Medicare Part D subsidies, which are immaterial.