Funded Status (Details) - USD ($)		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Plan Assets, Payment for Settlement		$ 195,000,000		$ 197,000,000
Components of Net Periodic Benefit Cost (Credit) [Abstract]
Settlement Charge Recognized in Operating and Maintenance Expenses		2,491,000,000		2,321,000,000		$ 2,324,000,000
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation at Dec. 31		2,672,000,000		3,469,000,000
Change in Projected Benefit Obligation [Roll Forward]
Obligation at Jan. 1		3,718,000,000		3,964,000,000
Service cost		97,000,000		104,000,000		95,000,000
Interest cost		110,000,000		104,000,000		125,000,000
Plan amendments		1,000,000		5,000,000
Actuarial loss		(703,000,000)		(94,000,000)
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant		0		0
Defined Benefit Plan, Benefit Obligation, Prescription Drug Subsidy Receipt		0		0
Benefit payments	[1]	(352,000,000)		(365,000,000)
Obligation at Dec. 31		2,871,000,000		3,718,000,000		3,964,000,000
Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at Jan. 1		3,670,000,000	[2]	3,599,000,000
Actual return (loss) on plan assets		(683,000,000)		305,000,000
Employer contributions		50,000,000		131,000,000
Benefit payments		(352,000,000)		(365,000,000)
Fair value of plan assets at Dec. 31		2,685,000,000	[2]	3,670,000,000	[2]	3,599,000,000
Funded Status of Plans at Dec. 31 [Abstract]
Funded status		(186,000,000)		(48,000,000)
Assets for Plan Benefits, Defined Benefit Plan		15,000,000		19,000,000
Amounts Not Yet Recognized as Components of Net Periodic Benefit Cost [Abstract]
Net loss		1,021,000,000		978,000,000
Prior service (credit) cost		(7,000,000)		(9,000,000)
Total		1,014,000,000		969,000,000
Amounts Not Yet Recognized as Components of Net Periodic Benefit Cost Have Been Recorded as Follows Based Upon Expected Recovery in Rates [Abstract]
Current regulatory assets		21,000,000		74,000,000
Noncurrent regulatory assets		943,000,000		846,000,000
Deferred income taxes		14,000,000		13,000,000
Net-of-tax accumulated other comprehensive income		36,000,000		36,000,000
Total		$ 1,014,000,000		$ 969,000,000
Significant Assumptions Used to Measure Benefit Obligations [Abstract]
Discount rate for year-end valuation (as a percent)		5.80%		3.08%
Expected average long-term increase in compensation level (as a percent)		4.25%		3.75%
Components of Net Periodic Benefit Cost (Credit) [Abstract]
Service cost		$ 97,000,000		$ 104,000,000		95,000,000
Interest cost		110,000,000		104,000,000		125,000,000
Expected return on plan assets		(208,000,000)		(206,000,000)		(208,000,000)
Amortization of prior service cost (credit)		(1,000,000)		(1,000,000)		(4,000,000)
Amortization of net loss		75,000,000		107,000,000		100,000,000
Settlement charge	[3]	71,000,000		59,000,000		0
Net periodic benefit cost		144,000,000		167,000,000		108,000,000
Costs not recognized due to regulation		(30,000,000)		(46,000,000)		9,000,000
Net benefit cost recognized for financial reporting		114,000,000		121,000,000		117,000,000
Settlement Charge Recognized in Operating and Maintenance Expenses		$ 9,000,000		$ 0		$ 7
Significant Assumptions Used to Measure Costs [Abstract]
Discount rate (as a percent)		3.08%		2.71%		3.49%
Expected average long-term increase in compensation level (as a percent)		3.75%		3.75%		3.75%
Expected average long-term rate of return on assets (as a percent)		6.49%		6.49%		6.87%
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant		$ 0		$ 0
Amounts Not Yet Recognized As Components Of Net Periodic Benefit Cost Recorded As Current Regulatory Liabilities		0		0
Amounts Not Yet Recognized As Components Of Net Periodic Benefit Cost Recorded As Noncurrent Regulatory Liabilities		0		0
Other Postretirement Benefits Plan [Member]
Change in Projected Benefit Obligation [Roll Forward]
Obligation at Jan. 1		511,000,000		574,000,000
Service cost		2,000,000		2,000,000		$ 1,000,000
Interest cost		15,000,000		15,000,000		18,000,000
Plan amendments		0		0
Actuarial loss		(85,000,000)		(41,000,000)
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant		8,000,000		8,000,000
Defined Benefit Plan, Benefit Obligation, Prescription Drug Subsidy Receipt		2,000,000		2,000,000
Benefit payments	[1]	(48,000,000)		(49,000,000)
Obligation at Dec. 31		405,000,000		511,000,000		574,000,000
Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at Jan. 1		442,000,000	[4]	452,000,000
Actual return (loss) on plan assets		(51,000,000)		16,000,000
Employer contributions		13,000,000		15,000,000
Benefit payments		(48,000,000)		(49,000,000)
Fair value of plan assets at Dec. 31		364,000,000	[4]	442,000,000	[4]	452,000,000
Funded Status of Plans at Dec. 31 [Abstract]
Funded status		(41,000,000)		(69,000,000)
Assets for Plan Benefits, Defined Benefit Plan		33,000,000		33,000,000
Amounts Not Yet Recognized as Components of Net Periodic Benefit Cost [Abstract]
Net loss		63,000,000		81,000,000
Prior service (credit) cost		(1,000,000)		(7,000,000)
Total		62,000,000		74,000,000
Amounts Not Yet Recognized as Components of Net Periodic Benefit Cost Have Been Recorded as Follows Based Upon Expected Recovery in Rates [Abstract]
Current regulatory assets		0		0
Noncurrent regulatory assets		78,000,000		90,000,000
Deferred income taxes		1,000,000		1,000,000
Net-of-tax accumulated other comprehensive income		4,000,000		3,000,000
Total		$ 62,000,000		$ 74,000,000
Significant Assumptions Used to Measure Benefit Obligations [Abstract]
Discount rate for year-end valuation (as a percent)		5.80%		3.09%
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Pre-65		6.50%		5.30%
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Post-65		5.50%		4.90%
Components of Net Periodic Benefit Cost (Credit) [Abstract]
Service cost		$ 2,000,000		$ 2,000,000		1,000,000
Interest cost		15,000,000		15,000,000		18,000,000
Expected return on plan assets		(18,000,000)		(18,000,000)		(19,000,000)
Amortization of prior service cost (credit)		(6,000,000)		(8,000,000)		(8,000,000)
Amortization of net loss		2,000,000		5,000,000		4,000,000
Settlement charge	[3]	0		0		0
Net periodic benefit cost		(5,000,000)		(4,000,000)		(4,000,000)
Costs not recognized due to regulation		3,000,000		2,000,000		3,000,000
Net benefit cost recognized for financial reporting		$ (2,000,000)		$ (2,000,000)		$ (1,000,000)
Significant Assumptions Used to Measure Costs [Abstract]
Discount rate (as a percent)		3.09%		2.65%		3.47%
Expected average long-term increase in compensation level (as a percent)		0.00%		0.00%		0.00%
Expected average long-term rate of return on assets (as a percent)		4.10%		4.10%		4.50%
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant		$ 8,000,000		$ 8,000,000
Amounts Not Yet Recognized As Components Of Net Periodic Benefit Cost Recorded As Current Regulatory Liabilities		1,000,000		1,000,000
Amounts Not Yet Recognized As Components Of Net Periodic Benefit Cost Recorded As Noncurrent Regulatory Liabilities		$ 20,000,000		$ 19,000,000
Ultimate health care trend assumption rate (as a percent)		4.50%		4.50%
Period until ultimate trend rate is reached (in years)		$ 7		$ 4

[1] ncludes approximately $195 million in 2022 and $197 million in 2021 of lump-sum benefit payments used in the determination of a settlement charge.

[2] See Note 10 for further information regarding 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 and 2021, as a result of lump-sum distributions during each plan year, Xcel Energy recorded a total pension settlement charge of $71 million and $59 million, respectively, the majority of which was not recognized due to the effects of regulation. A total of $9 million and $7 million was recorded in the consolidated statements of income in 2022 and 2021, respectively. There were no settlement charges recorded for the qualified pension plans in 2020.

[4] See Note 10 for further information on fair value measurement inputs and methods.