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Funded Status (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Change in Fair Value of Plan Assets [Roll Forward]      
Defined Benefit Plan, Plan Assets, Payment for Settlement $ 168,000,000    
Components of Net Periodic Benefit Cost (Credit) [Abstract]      
Settlement Charge Recognized in Operating and Maintenance Expenses 2,540,000,000 $ 2,444,000,000 $ 2,491,000,000
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 2,554,000,000 2,728,000,000  
Change in Projected Benefit Obligation [Roll Forward]      
Obligation at Jan. 1 2,943,000,000 2,871,000,000  
Service cost 76,000,000 74,000,000 97,000,000
Interest cost 151,000,000 158,000,000 110,000,000
Plan amendments 0 (3,000,000)  
Actuarial loss (77,000,000) 126,000,000  
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant 0 0  
Benefit payments [1] (341,000,000) (283,000,000)  
Obligation at Dec. 31 2,752,000,000 2,943,000,000 2,871,000,000
Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at Jan. 1 2,690,000,000 [2] 2,685,000,000  
Actual return (loss) on plan assets 55,000,000 238,000,000  
Employer contributions 100,000,000 50,000,000  
Benefit payments (341,000,000) (283,000,000)  
Fair value of plan assets at Dec. 31 2,504,000,000 [2] 2,690,000,000 [2] 2,685,000,000
Funded Status of Plans at Dec. 31 [Abstract]      
Funded status (248,000,000) (253,000,000)  
Assets for Plan Benefits, Defined Benefit Plan 0 1,000,000  
Amounts Not Yet Recognized as Components of Net Periodic Benefit Cost [Abstract]      
Net loss 1,074,000,000 1,096,000,000  
Prior service (credit) cost (8,000,000) (9,000,000)  
Total 1,066,000,000 1,087,000,000  
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 32,000,000 20,000,000  
Noncurrent regulatory assets 983,000,000 1,014,000,000  
Deferred income taxes 14,000,000 14,000,000  
Net-of-tax accumulated other comprehensive income 37,000,000 39,000,000  
Total $ 1,066,000,000 $ 1,087,000,000  
Significant Assumptions Used to Measure Benefit Obligations [Abstract]      
Discount rate for year-end valuation (as a percent) 5.88% 5.49%  
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 $ 76,000,000 $ 74,000,000 97,000,000
Interest cost 151,000,000 158,000,000 110,000,000
Expected return on plan assets (206,000,000) (209,000,000) (208,000,000)
Amortization of prior service cost (credit) (2,000,000) (1,000,000) (1,000,000)
Amortization of net loss 30,000,000 22,000,000 75,000,000
Settlement charge [3] 67,000,000 0 71,000,000
Net periodic benefit cost 116,000,000 44,000,000 144,000,000
Costs not recognized due to regulation (37,000,000) 30,000,000 (30,000,000)
Net benefit cost recognized for financial reporting 79,000,000 74,000,000 114,000,000
Settlement Charge Recognized in Operating and Maintenance Expenses $ 8,000,000 $ 0 $ 9
Significant Assumptions Used to Measure Costs [Abstract]      
Discount rate (as a percent) 5.49% 5.80% 3.08%
Expected average long-term increase in compensation level (as a percent) 4.25% 4.25% 3.75%
Expected average long-term rate of return on assets (as a percent) 6.93% 6.93% 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. 1 394,000,000 405,000,000  
Service cost 1,000,000 1,000,000 $ 2,000,000
Interest cost 21,000,000 22,000,000 15,000,000
Plan amendments 0 0  
Actuarial loss 55,000,000 14,000,000  
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant 9,000,000 8,000,000  
Benefit payments [1] (53,000,000) (56,000,000)  
Obligation at Dec. 31 427,000,000 394,000,000 405,000,000
Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at Jan. 1 356,000,000 [4] 364,000,000  
Actual return (loss) on plan assets 21,000,000 29,000,000  
Employer contributions 11,000,000 11,000,000  
Benefit payments (53,000,000) (56,000,000)  
Fair value of plan assets at Dec. 31 344,000,000 [4] 356,000,000 [4] 364,000,000
Funded Status of Plans at Dec. 31 [Abstract]      
Funded status (83,000,000) (38,000,000)  
Assets for Plan Benefits, Defined Benefit Plan 10,000,000 28,000,000  
Amounts Not Yet Recognized as Components of Net Periodic Benefit Cost [Abstract]      
Net loss 113,000,000 64,000,000  
Prior service (credit) cost 0 0  
Total 113,000,000 64,000,000  
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 2,000,000  
Noncurrent regulatory assets 127,000,000 79,000,000  
Deferred income taxes 1,000,000 1,000,000  
Net-of-tax accumulated other comprehensive income 2,000,000 2,000,000  
Total $ 113,000,000 $ 64,000,000  
Significant Assumptions Used to Measure Benefit Obligations [Abstract]      
Discount rate for year-end valuation (as a percent) 5.88% 5.54%  
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Pre-65 7.00% 6.50%  
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Post-65 7.50% 5.50%  
Components of Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost $ 1,000,000 $ 1,000,000 2,000,000
Interest cost 21,000,000 22,000,000 15,000,000
Expected return on plan assets (17,000,000) (17,000,000) (18,000,000)
Amortization of prior service cost (credit) 0 (1,000,000) (6,000,000)
Amortization of net loss 2,000,000 1,000,000 2,000,000
Settlement charge [3] 0 0 0
Net periodic benefit cost 7,000,000 6,000,000 (5,000,000)
Costs not recognized due to regulation 0 0 3,000,000
Net benefit cost recognized for financial reporting $ 7,000,000 $ 6,000,000 $ (2,000,000)
Significant Assumptions Used to Measure Costs [Abstract]      
Discount rate (as a percent) 5.54% 5.80% 3.09%
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% 5.00% 4.10%
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant $ 9,000,000 $ 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 $ 18,000,000 $ 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) $ 9 $ 6  
[1] Includes lump-sum benefit payments used in the determination of settlement charges of $168 million in 2024.
[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 2024 and 2022, as a result of lump-sum distributions during each plan year, Xcel Energy recorded a total pension settlement charge of $67 million and $71 million, respectively, the majority of which was not recognized due to the effects of regulation. A total of $8 million and $9 million was recorded in the consolidated statements of income in 2024 and 2022, respectively. There were no settlement charges recorded for the qualified pension plans in 2023.
[4] See Note 10 for further information on fair value measurement inputs and methods.