Benefit Plans and Other Postretirement Benefits, Pension Benefits (Details) - USD ($)		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021	Jan. 01, 2020	Jan. 01, 2019
Target Pension Asset Allocations [Abstract]
annual interest crediting rates			$ 5.03		$ 5.14		$ 2.26
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets at net asset value			464,000,000	[1]	317,000,000	[2]
Fair value of plan assets			1,037,000,000	[1]	1,031,000,000	[2]	1,351,000,000
Pension Benefits [Abstract]
Total benefit obligation			1,071,000,000		1,032,000,000			$ 1,032,000,000	$ 1,363,000,000
Net benefit cost recognized for financial reporting			$ 11,000,000		$ 22,000,000		$ 30,000,000
Expected average long-term rate of return on assets (as a percent)			6.53%		6.39%		6.38%
Target Pension Asset Allocations [Abstract]
Target pension asset allocations (as a percent)			100.00%		100.00%
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement	[3]		$ 0		$ (3,000,000)		$ 0
Pension Plan [Member] | PSCo [Member]
Target Pension Asset Allocations [Abstract]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement					(3,000,000)
Total contributions to Xcel Energy's pension plans during the period			0		40,000,000		$ 46,000,000
Supplemental Executive Retirement Plan (SERP) and Nonqualified Pension Plan
Pension Benefits [Abstract]
Total benefit obligation			1,000,000		1,000,000
Xcel Energy Inc. | Supplemental Executive Retirement Plan (SERP) and Nonqualified Pension Plan
Pension Benefits [Abstract]
Total benefit obligation			12,000,000		11,000,000
Net benefit cost recognized for financial reporting			2,000,000		17,000,000
Equity Securities [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets at net asset value			0	[1]	0	[2]
Fair value of plan assets			$ 12,000,000	[1]	$ 17,000,000	[2]
Target Pension Asset Allocations [Abstract]
Target pension asset allocations (as a percent)			31.00%		33.00%
Long-Duration Fixed Income and Interest Rate Swap Securities [Member] | Pension Plan [Member]
Target Pension Asset Allocations [Abstract]
Target pension asset allocations (as a percent)			38.00%		38.00%
Short-to-intermediate fixed income securities [Member] | Pension Plan [Member]
Target Pension Asset Allocations [Abstract]
Target pension asset allocations (as a percent)			9.00%		9.00%
Alternative Investments [Member] | Pension Plan [Member]
Target Pension Asset Allocations [Abstract]
Target pension asset allocations (as a percent)			20.00%		18.00%
Cash | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets at net asset value			$ 0	[1]	$ 0	[2]
Fair value of plan assets			$ 94,000,000	[1]	$ 52,000,000	[2]
Target Pension Asset Allocations [Abstract]
Target pension asset allocations (as a percent)			2.00%		2.00%
Subsequent Event | Pension Plan [Member]
Pension Benefits [Abstract]
Expected average long-term rate of return on assets for next fiscal year (as a percent)		6.53%

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

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

[3] A settlement charge is required when the amount of all lump-sum distributions during the year is greater than the sum of the service and interest cost components of the annual net periodic pension cost. In 2022, as a result of lump-sum distributions during the plan year, PSCo recorded a total pension settlement charge of $3 million. An immaterial amount was recorded in the income statement in 2022. There were no settlement charges recorded to the qualified pension plans in 2023 or 2021