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Recurring Fair Value Measurements (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration] |  | Assets, Current |  | Assets, Current |  |  | Assets, Current
Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration] |  | Other Assets, Noncurrent |  | Other Assets, Noncurrent |  |  | Other Assets, Noncurrent
Derivative Liability, Noncurrent |  | $ 91 |  | $ 91 |  |  | $ 86
Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] |  | Liabilities, Other than Long-Term Debt, Noncurrent |  | Liabilities, Other than Long-Term Debt, Noncurrent |  |  | Liabilities, Other than Long-Term Debt, Noncurrent
Reclaim Cash Collateral |  | $ 5 |  | $ 5 |  |  | $ 7
Changes in Level 3 Commodity Derivatives [Roll Forward] |  |  |  |  |  |  |
Fair value hedges |  | 0 | $ 0 | 0 | $ 0 |  |
Return Cash Collateral |  | 0 |  | 0 |  |  | 0
Derivative Asset, Current |  | $ 234 |  | $ 234 |  |  | $ 104
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration] |  | Liabilities, Current |  | Liabilities, Current |  |  | Liabilities, Current
Derivative Liability, Current |  | $ 44 |  | $ 44 |  |  | $ 74
Commodity Trading |  |  |  |  |  |  |
Changes in Level 3 Commodity Derivatives [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period |  | 91 | 78 | 90 | 235 |  |
Purchases | [1] | 174 | 167 | 177 | 172 |  |
Settlements | [1] | (110) | (47) | (161) | (76) |  |
Gains (losses) recognized in earnings | [2] | 3 | 10 | 3 | (2) |  |
Net gains recognized as regulatory assets and liabilities (a) | [1] | 81 | 1 | 130 | (120) |  |
Balance at end of period |  | 239 | 209 | 239 | 209 |  |
Other Derivative Instruments |  |  |  |  |  |  |
Changes in Level 3 Commodity Derivatives [Roll Forward] |  |  |  |  |  |  |
Pre-tax gains (losses) reclassified into income during the period from regulatory assets and (liabilities) |  | (15) | 11 | (3) | 104 |  |
Other Derivative Instruments | Electric Commodity |  |  |  |  |  |  |
Changes in Level 3 Commodity Derivatives [Roll Forward] |  |  |  |  |  |  |
Pre-tax gains (losses) reclassified into income during the period from regulatory assets and (liabilities) | [3] | (15) | 11 | (3) | 94 |  |
Other Derivative Instruments | Natural Gas Commodity |  |  |  |  |  |  |
Changes in Level 3 Commodity Derivatives [Roll Forward] |  |  |  |  |  |  |
Pre-tax gains (losses) reclassified into income during the period from regulatory assets and (liabilities) |  |  |  | 0 | 10 | [4] |
Other Derivative Instruments | Natural Gas Commodity | Electric fuel and purchased power |  |  |  |  |  |  |
Changes in Level 3 Commodity Derivatives [Roll Forward] |  |  |  |  |  |  |
Pre-tax gains (losses) reclassified into income during the period from regulatory assets and (liabilities) |  |  |  | 2 |  |  |
Designated as Hedging Instrument | Cash Flow Hedges |  |  |  |  |  |  |
Changes in Level 3 Commodity Derivatives [Roll Forward] |  |  |  |  |  |  |
Pre-tax gains (losses) reclassified into income during the period from regulatory assets and (liabilities) |  | 0 | $ 0 | 0 | $ 0 |  |
Fair Value Measured on a Recurring Basis |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative Liability, Gross |  | 93 |  | 93 |  |  | 133
Netting | [5] | (56) |  | (56) |  |  | (67)
Derivative Liability, Noncurrent |  | 72 |  | 72 |  |  | 64
Changes in Level 3 Commodity Derivatives [Roll Forward] |  |  |  |  |  |  |
Derivative Asset, Current |  | 232 |  | 232 |  |  | 101
Derivative Liability, Current |  | 37 |  | 37 |  |  | 66
Fair Value Measured on a Recurring Basis | Level 1 |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative Liability, Gross |  | 6 |  | 6 |  |  | 6
Fair Value Measured on a Recurring Basis | Level 2 |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative Liability, Gross |  | 78 |  | 78 |  |  | 115
Fair Value Measured on a Recurring Basis | Level 3 |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative Liability, Gross |  | 9 |  | 9 |  |  | 12
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Commodity Trading |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative Liability, Gross |  | 89 |  | 89 |  |  | 97
Netting | [5] | (53) |  | (53) |  |  | (60)
Derivative Liability, Noncurrent |  | 72 |  | 72 |  |  | 64
Changes in Level 3 Commodity Derivatives [Roll Forward] |  |  |  |  |  |  |
Derivative Asset, Current |  | 20 |  | 20 |  |  | 32
Derivative Liability, Current |  | 36 |  | 36 |  |  | 37
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Electric Commodity |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative Liability, Gross |  | 3 |  | 3 |  |  | 7
Netting | [5] | (3) |  | (3) |  |  | (7)
Changes in Level 3 Commodity Derivatives [Roll Forward] |  |  |  |  |  |  |
Derivative Asset, Current |  | 208 |  | 208 |  |  | 55
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Natural Gas Commodity |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative Liability, Gross |  | 1 |  | 1 |  |  | 12
Netting | [5] | 0 |  | 0 |  |  | 0
Changes in Level 3 Commodity Derivatives [Roll Forward] |  |  |  |  |  |  |
Derivative Asset, Current |  | 4 |  | 4 |  |  | 14
Derivative Liability, Current |  | 1 |  | 1 |  |  | 12
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 1 | Commodity Trading |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative Liability, Gross |  | 6 |  | 6 |  |  | 6
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 1 | Electric Commodity |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative Liability, Gross |  | 0 |  | 0 |  |  | 0
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 1 | Natural Gas Commodity |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative Liability, Gross |  | 0 |  | 0 |  |  | 0
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 2 | Commodity Trading |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative Liability, Gross |  | 77 |  | 77 |  |  | 86
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 2 | Electric Commodity |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative Liability, Gross |  | 0 |  | 0 |  |  | 0
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 2 | Natural Gas Commodity |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative Liability, Gross |  | 1 |  | 1 |  |  | 12
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 3 | Commodity Trading |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative Liability, Gross |  | 6 |  | 6 |  |  | 5
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 3 | Electric Commodity |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative Liability, Gross |  | 3 |  | 3 |  |  | 7
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 3 | Natural Gas Commodity |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative Liability, Gross |  | 0 |  | 0 |  |  | 0
Fair Value Measured on a Recurring Basis | Designated as Hedging Instrument | Interest Rate Swap |  |  |  |  |  |  |
Changes in Level 3 Commodity Derivatives [Roll Forward] |  |  |  |  |  |  |
Derivative Liability, Current |  |  |  |  |  |  | 17
Fair Value, Measurements, Nonrecurring | PPAs |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative Liability, Noncurrent | [6] | 19 |  | 19 |  |  | 22
Changes in Level 3 Commodity Derivatives [Roll Forward] |  |  |  |  |  |  |
Derivative Asset, Current | [6] | 2 |  | 2 |  |  | 3
Derivative Liability, Current | [6] | $ 7 |  | $ 7 |  |  | $ 8
[1] | Relates primarily to NSP-Minnesota and SPS FTR instruments administered by MISO and SPP.
[2] | Relates to commodity trading and is subject to substantial offsetting losses and gains on derivative instruments categorized as levels 1 and 2 in the income statement. See above tables for the income statement impact of derivative activity, including commodity trading gains and losses.
[3] | Recorded to electric fuel and purchased power. These derivative settlement gains and losses are shared with electric customers through fuel and purchased energy cost-recovery mechanisms, and reclassified out of income as regulatory assets or liabilities, as appropriate. FTR settlements are shared with customers and do not have a material impact on net income. Presented amounts reflect changes in fair value between auction and settlement dates, but exclude the original auction fair value.
[4] | Other than $2 million of 2024 losses recorded to electric fuel and purchased power, amounts are recorded to cost of natural gas sold and transported. Amounts are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset, as appropriate.
[5] | Xcel Energy nets derivative instruments and related collateral on its consolidated balance sheets when supported by a legally enforceable master netting agreement. At June 30, 2024 and Dec. 31, 2023, derivative assets and liabilities include no obligations to return cash collateral. At June 30, 2024 and Dec. 31, 2023, derivative assets and liabilities include rights to reclaim cash collateral of $5 million and $7 million, respectively. Counterparty netting amounts presented exclude settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.
[6] | Xcel Energy currently applies the normal purchase exception to qualifying PPAs. Balance relates to specific contracts that were previously recognized at fair value prior to applying the normal purchase exception, and are being amortized over the remaining contract lives along with the offsetting regulatory assets and liabilities.

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- Definition This element represents total gains (losses) for the period (realized and unrealized), arising from net assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are recognized in regulatory assets and liabilities. + References No definition available. + Details
Name: | xel_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetLiabilityNetLossesGainsRecognizedAsRegulatoryAssetsAndLiabilities
Namespace Prefix: | xel_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Pre-tax gains (losses) reclassified into income during the period from regulatory assets and (liabilities) + References No definition available. + Details
Name: | xel_Pretaxgainslossesreclassifiedintoincomeduringtheperiodfromregulatoryassetsandliabilities
Namespace Prefix: | xel_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_CommodityContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=xel_ElectricCommodityContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=xel_NaturalGasCommodityContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=xel_ElectricFuelAndPurchasedPowerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=xel_PurchasedPowerAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |