Benefit Plans and Other Postretirement Benefits, Pension Benefits (Details) - USD ($)		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019	Jan. 01, 2020	Jan. 01, 2019
Target Pension Asset Allocations [Abstract]
annual interest crediting rates			$ 2.26		$ 2.24		$ 3.11
Asset Transfers			0		0
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets at net asset value			421,000,000	[1]	388,000,000	[2]
Fair value of plan assets			1,351,000,000	[1]	1,283,000,000	[2]		$ 1,283,000,000	$ 1,124,000,000
Pension Benefits [Abstract]
Total benefit obligation			1,363,000,000		1,428,000,000			$ 1,428,000,000	$ 1,330,000,000
Net benefit cost recognized for financial reporting			$ 30,000,000		$ 37,000,000		$ 38,000,000
Minimum number of years historical achieved weighted average annual returns used to determine investment return assumptions (in years)			20 years
Expected average long-term rate of return on assets (as a percent)			6.38%		6.84%		6.84%
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		$ 0		$ (3,000,000)
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)
Supplemental Executive Retirement Plan (SERP) and Nonqualified Pension Plan
Pension Benefits [Abstract]
Total benefit obligation			2,000,000		2,000,000
Xcel Energy Inc. | Supplemental Executive Retirement Plan (SERP) and Nonqualified Pension Plan
Pension Benefits [Abstract]
Total benefit obligation			43,000,000		43,000,000
Net benefit cost recognized for financial reporting			4,000,000		6,000,000
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			$ 24,000,000	[1]	$ 27,000,000	[2]
Target Pension Asset Allocations [Abstract]
Target pension asset allocations (as a percent)			33.00%		35.00%
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)			37.00%		35.00%
Short-to-intermediate fixed income securities [Member] | Pension Plan [Member]
Target Pension Asset Allocations [Abstract]
Target pension asset allocations (as a percent)			11.00%		13.00%
Alternative Investments [Member] | Pension Plan [Member]
Target Pension Asset Allocations [Abstract]
Target pension asset allocations (as a percent)			17.00%		15.00%
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			$ 49,000,000	[1]	$ 75,000,000	[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)		6.39%

[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 2019, 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 2019. There were no settlement charges recorded to the qualified pension plans in 2021 or 2020