Benefit Plans and Other Postretirement Benefits, Pension Benefits (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Supplemental Executive Retirement Plan (SERP) and Nonqualified Pension Plan
Pension Benefits [Abstract]
Total benefit obligation			$ 3		$ 4
Net benefit cost recognized for financial reporting					1
Pension Plan
Pension Benefits [Abstract]
Fair value of plan assets			853	[1]	897	[1]	$ 815
Total benefit obligation			877		989		942
Net benefit cost recognized for financial reporting			$ 28		$ 32		$ 33
Expected average long-term rate of return on assets (as a percent)			6.60%		7.10%		7.10%
Target Pension Asset Allocations [Abstract]
Target pension asset allocations (as a percent)			100.00%		100.00%
Pension Plan | Domestic and international equity securities
Pension Benefits [Abstract]
Fair value of plan assets	[1]		$ 16		$ 20
Target Pension Asset Allocations [Abstract]
Target pension asset allocations (as a percent)			33.00%		35.00%
Pension Plan | Long-duration fixed income and interest rate swap securities
Target Pension Asset Allocations [Abstract]
Target pension asset allocations (as a percent)			37.00%		35.00%
Pension Plan | Short-to-intermediate fixed income securities
Target Pension Asset Allocations [Abstract]
Target pension asset allocations (as a percent)			11.00%		13.00%
Pension Plan | Alternative investments
Target Pension Asset Allocations [Abstract]
Target pension asset allocations (as a percent)			17.00%		15.00%
Pension Plan | Cash
Pension Benefits [Abstract]
Fair value of plan assets	[1]		$ 31		$ 52
Target Pension Asset Allocations [Abstract]
Target pension asset allocations (as a percent)			2.00%		2.00%
Xcel Energy Inc. | Supplemental Executive Retirement Plan (SERP) and Nonqualified Pension Plan
Pension Benefits [Abstract]
Total benefit obligation			$ 43		$ 43
Net benefit cost recognized for financial reporting			$ 4		$ 6
Forecast [Member] | Pension Plan
Pension Benefits [Abstract]
Expected average long-term rate of return on assets for next fiscal year (as a percent)		6.60%

[1] See Note 8 for further information on fair value measurement inputs and methods.