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Benefit Plans and Other Postretirement Benefits, Postretirement Benefit Plan Benefit Obligations, Cash Flows and Benefit Costs (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Change in Projected Benefit Obligation [Roll Forward] |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Payment for Settlement |  | $ 168,000,000 |  |  |  |
Funded Status of Plans at Dec. 31 [Abstract] |  |  |  |  |  |
Noncurrent liabilities |  | (477,000,000) |  | $ (469,000,000) |  |
Pension Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Plan amendments |  | 0 |  | (3,000,000) |  |
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
Actuarial loss |  | (77,000,000) |  | 126,000,000 |  |
Plan participants' contributions |  | 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 |  |
Participant contributions |  | 0 |  | 0 |  |
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 |  | (248,000,000) |  | (253,000,000) |  |
Funded Status of Plans at Dec. 31 [Abstract] |  |  |  |  |  |
Assets for Plan Benefits, Defined Benefit Plan |  | 0 |  | 1,000,000 |  |
Current liabilities |  | 0 |  | 0 |  |
Noncurrent liabilities |  | (248,000,000) |  | (254,000,000) |  |
Net postretirement amounts recognized on consolidated balance sheets |  | (248,000,000) |  | (253,000,000) |  |
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 |  |
Current regulatory liabilities |  | 0 |  | 0 |  |
Noncurrent regulatory liabilities |  | 0 |  | 0 |  |
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% |  |
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
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement | [3] | (67,000,000) |  | 0 |  | (71,000,000)
Net periodic benefit cost |  | $ 116,000,000 |  | $ 44,000,000 |  | $ 144,000,000
Significant Assumptions Used to Measure Costs [Abstract] |  |  |  |  |  |
Discount rate (as a percent) |  | 5.49% |  | 5.80% |  | 3.08%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase |  | 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, 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
Other Postretirement Benefits Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Plan amendments |  | 0 |  | 0 |  |
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
Actuarial loss |  | 55,000,000 |  | 14,000,000 |  |
Plan participants' contributions |  | 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 |  |
Participant contributions |  | 9,000,000 |  | 8,000,000 |  |
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 |  | (83,000,000) |  | (38,000,000) |  |
Funded Status of Plans at Dec. 31 [Abstract] |  |  |  |  |  |
Assets for Plan Benefits, Defined Benefit Plan |  | 10,000,000 |  | 28,000,000 |  |
Current liabilities |  | (4,000,000) |  | (3,000,000) |  |
Noncurrent liabilities |  | (89,000,000) |  | (63,000,000) |  |
Net postretirement amounts recognized on consolidated balance sheets |  | (83,000,000) |  | (38,000,000) |  |
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 |  |
Current regulatory liabilities |  | (1,000,000) |  | (1,000,000) |  |
Noncurrent regulatory liabilities |  | (18,000,000) |  | (19,000,000) |  |
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% |  |
Ultimate health care trend assumption rate (as a percent) |  | 4.50% |  | 4.50% |  |
Period until ultimate trend rate is reached (in years) |  | $ 9 |  | $ 6 |  |
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
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement | [3] | 0 |  | 0 |  | 0
Net periodic benefit cost |  | $ 7,000,000 |  | $ 6,000,000 |  | $ (5,000,000)
Significant Assumptions Used to Measure Costs [Abstract] |  |  |  |  |  |
Discount rate (as a percent) |  | 5.54% |  | 5.80% |  | 3.09%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase |  | 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, 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)
[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.

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- Definition Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Post-65 + References No definition available. + Details
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Namespace Prefix: | xel_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Pre-65 + References No definition available. + Details
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Namespace Prefix: | xel_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
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- Definition The total mount of net periodic benefit cost, before regulatory adjustments, for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain or loss, prior service cost or credit, transition asset or obligation, and gain or loss due to settlements or curtailments, before regulatory adjustments. + References No definition available. + Details
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Namespace Prefix: | xel_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The time period (in years) until the ultimate health care cost trend rate is expected to be reached. + References No definition available. + Details
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Namespace Prefix: | xel_
Data Type: | xbrli:monetaryItemType
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |