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Funded Status (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Change in Fair Value of Plan Assets [Roll Forward]      
Defined Benefit Plan, Plan Assets, Payment for Settlement   $ 195,000,000  
Components of Net Periodic Benefit Cost (Credit) [Abstract]      
Settlement Charge Recognized in Operating and Maintenance Expenses $ 2,444,000,000 2,491,000,000 $ 2,321,000,000
Significant Assumptions Used to Measure Costs [Abstract]      
transferred 0 0  
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated Benefit Obligation at Dec. 31 2,728,000,000 2,672,000,000  
Change in Projected Benefit Obligation [Roll Forward]      
Obligation at Jan. 1 2,871,000,000 3,718,000,000  
Service cost 74,000,000 97,000,000 104,000,000
Interest cost 158,000,000 110,000,000 104,000,000
Plan amendments (3,000,000) 1,000,000  
Actuarial loss 126,000,000 (703,000,000)  
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] (283,000,000) (352,000,000)  
Obligation at Dec. 31 2,943,000,000 2,871,000,000 3,718,000,000
Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at Jan. 1 2,685,000,000 [2] 3,670,000,000  
Actual return (loss) on plan assets 238,000,000 (683,000,000)  
Employer contributions 50,000,000 50,000,000  
Benefit payments (283,000,000) (352,000,000)  
Fair value of plan assets at Dec. 31 2,690,000,000 [2] 2,685,000,000 [2] 3,670,000,000
Funded Status of Plans at Dec. 31 [Abstract]      
Funded status (253,000,000) (186,000,000)  
Assets for Plan Benefits, Defined Benefit Plan 1,000,000 15,000,000  
Amounts Not Yet Recognized as Components of Net Periodic Benefit Cost [Abstract]      
Net loss 1,096,000,000 1,021,000,000  
Prior service (credit) cost (9,000,000) (7,000,000)  
Total 1,087,000,000 1,014,000,000  
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 20,000,000 21,000,000  
Noncurrent regulatory assets 1,014,000,000 943,000,000  
Deferred income taxes 14,000,000 14,000,000  
Net-of-tax accumulated other comprehensive income 39,000,000 36,000,000  
Total $ 1,087,000,000 $ 1,014,000,000  
Significant Assumptions Used to Measure Benefit Obligations [Abstract]      
Discount rate for year-end valuation (as a percent) 5.49% 5.80%  
Expected average long-term increase in compensation level (as a percent) 4.25% 4.25%  
Components of Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost $ 74,000,000 $ 97,000,000 104,000,000
Interest cost 158,000,000 110,000,000 104,000,000
Expected return on plan assets (209,000,000) (208,000,000) (206,000,000)
Amortization of prior service cost (credit) (1,000,000) (1,000,000) (1,000,000)
Amortization of net loss 22,000,000 75,000,000 107,000,000
Settlement charge [3] 0 71,000,000 59,000,000
Net periodic benefit cost 44,000,000 144,000,000 167,000,000
Costs not recognized due to regulation 30,000,000 (30,000,000) (46,000,000)
Net benefit cost recognized for financial reporting 74,000,000 114,000,000 121,000,000
Settlement Charge Recognized in Operating and Maintenance Expenses $ 0 $ 9,000,000 $ 7
Significant Assumptions Used to Measure Costs [Abstract]      
Discount rate (as a percent) 5.80% 3.08% 2.71%
Expected average long-term increase in compensation level (as a percent) 4.25% 3.75% 3.75%
Expected average long-term rate of return on assets (as a percent) 6.93% 6.49% 6.49%
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. 1 405,000,000 511,000,000  
Service cost 1,000,000 2,000,000 $ 2,000,000
Interest cost 22,000,000 15,000,000 15,000,000
Plan amendments 0 0  
Actuarial loss 14,000,000 (85,000,000)  
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant 8,000,000 8,000,000  
Defined Benefit Plan, Benefit Obligation, Prescription Drug Subsidy Receipt 0 2,000,000  
Benefit payments [1] (56,000,000) (48,000,000)  
Obligation at Dec. 31 394,000,000 405,000,000 511,000,000
Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at Jan. 1 364,000,000 [4] 442,000,000  
Actual return (loss) on plan assets 29,000,000 (51,000,000)  
Employer contributions 11,000,000 13,000,000  
Benefit payments (56,000,000) (48,000,000)  
Fair value of plan assets at Dec. 31 356,000,000 [4] 364,000,000 [4] 442,000,000
Funded Status of Plans at Dec. 31 [Abstract]      
Funded status (38,000,000) (41,000,000)  
Assets for Plan Benefits, Defined Benefit Plan 28,000,000 33,000,000  
Amounts Not Yet Recognized as Components of Net Periodic Benefit Cost [Abstract]      
Net loss 64,000,000 63,000,000  
Prior service (credit) cost 0 (1,000,000)  
Total 64,000,000 62,000,000  
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 2,000,000 0  
Noncurrent regulatory assets 79,000,000 78,000,000  
Deferred income taxes 1,000,000 1,000,000  
Net-of-tax accumulated other comprehensive income 2,000,000 4,000,000  
Total $ 64,000,000 $ 62,000,000  
Significant Assumptions Used to Measure Benefit Obligations [Abstract]      
Discount rate for year-end valuation (as a percent) 5.54% 5.80%  
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Pre-65 6.50% 6.50%  
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Post-65 5.50% 5.50%  
Components of Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost $ 1,000,000 $ 2,000,000 2,000,000
Interest cost 22,000,000 15,000,000 15,000,000
Expected return on plan assets (17,000,000) (18,000,000) (18,000,000)
Amortization of prior service cost (credit) (1,000,000) (6,000,000) (8,000,000)
Amortization of net loss 1,000,000 2,000,000 5,000,000
Settlement charge [3] 0 0 0
Net periodic benefit cost 6,000,000 (5,000,000) (4,000,000)
Costs not recognized due to regulation 0 3,000,000 2,000,000
Net benefit cost recognized for financial reporting $ 6,000,000 $ (2,000,000) $ (2,000,000)
Significant Assumptions Used to Measure Costs [Abstract]      
Discount rate (as a percent) 5.80% 3.09% 2.65%
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) 5.00% 4.10% 4.10%
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 $ 19,000,000 $ 20,000,000  
Ultimate health care trend assumption rate (as a percent) 4.50% 4.50%  
Period until ultimate trend rate is reached (in years) $ 6 $ 7  
[1] Includes lump-sum benefit payments used in the determination of a settlement charges of $195 million of in 2022.
[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. There were no settlement charges recorded for the qualified pension plans in 2023. 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.
[4] See Note 10 for further information on fair value measurement inputs and methods.