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Recurring Fair Value Measurements (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Derivatives, Fair Value [Line Items]      
Derivative Asset, Net $ 104 $ 279  
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration] Assets, Current Assets, Current  
Derivative Asset, Noncurrent $ 76 $ 93  
Derivative Liability, Net $ 86 $ 113  
Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Total deferred credits and other liabilities Total deferred credits and other liabilities  
Return Cash Collateral $ 0 $ 0  
Derivative Liability, Noncurrent 74 76  
Reclaim Cash Collateral $ 7 $ 53  
Changes in Level 3 Commodity Derivatives      
Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other assets Other assets  
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration] Total current liabilities Total current liabilities  
Commodity Contract      
Changes in Level 3 Commodity Derivatives      
Balance at Jan. 1 $ 236 $ 19 $ (49)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases [1] 176 406 65
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements [1] (154) (350) (158)
(Losses) gains recognized in earnings [2] 6 151 49
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Net Losses Gains Recognized As Regulatory Assets And Liabilities [1] (174) 10 112
Balance at Dec. 31 90 236 $ 19
Fair Value Measured on a Recurring Basis      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Net 101 276  
Derivative Asset, Noncurrent 76 90  
Derivative Liability, Net 64 83  
Derivative Liability, Noncurrent 66 59  
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Commodity Contract      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Net 32 82  
Derivative Asset, Noncurrent 76 90  
Derivative Liability, Net 64 83  
Derivative Liability, Noncurrent 37 45  
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Electric Commodity      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 62 177  
Netting [3] (7) (2)  
Derivative Asset, Net 55 175  
Derivative Liability, Gross 7 2  
Netting [3] (7) (2)  
Derivative Liability, Noncurrent 0 0  
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Electric Commodity | Level 1      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 0 0  
Derivative Liability, Gross 0 0  
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Electric Commodity | Level 2      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 0 0  
Derivative Liability, Gross 0 0  
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Electric Commodity | Level 3      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 62 177  
Derivative Liability, Gross 7 2  
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Natural Gas Commodity      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 14 19  
Netting [3] 0 0  
Derivative Asset, Net 14 19  
Derivative Liability, Gross 12 13  
Netting [3] 0 0  
Derivative Liability, Noncurrent 12 13  
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Natural Gas Commodity | Level 1      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 0 0  
Derivative Liability, Gross 0 0  
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Natural Gas Commodity | Level 2      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 14 19  
Derivative Liability, Gross 12 13  
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Natural Gas Commodity | Level 3      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 0 0  
Derivative Liability, Gross 0 0  
Fair Value Measured on a Recurring Basis | Designated as Hedging Instrument | Interest Rate Swap | Cash Flow Hedges      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Noncurrent 17 1  
Fair Value Measured on a Recurring Basis | Other Current Assets      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 167 520  
Netting [3] (66) (244)  
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 1      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 8 32  
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 2      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 65 278  
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 3      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 94 210  
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Commodity Contract      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 91 324  
Netting [3] (59) (242)  
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Commodity Contract | Level 1      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 8 32  
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Commodity Contract | Level 2      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 51 259  
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Commodity Contract | Level 3      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 32 33  
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 110 179  
Netting [3] (34) (89)  
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Level 1      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 14 34  
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Level 2      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 51 71  
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Level 3      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 45 74  
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Commodity Contract      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 110 179  
Netting [3] (34) (89)  
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Commodity Contract | Level 1      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 14 34  
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Commodity Contract | Level 2      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 51 71  
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Commodity Contract | Level 3      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 45 74  
Fair Value Measured on a Recurring Basis | Other Current Liabilities      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 133 348  
Netting [3] (67) (289)  
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Level 1      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 6 29  
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Level 2      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 115 311  
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Level 3      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 12 8  
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Commodity Contract      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 97 332  
Netting [3] (60) (287)  
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Commodity Contract | Level 1      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 6 29  
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Commodity Contract | Level 2      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 86 297  
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Commodity Contract | Level 3      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 5 6  
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Designated as Hedging Instrument | Interest Rate Swap      
Derivatives, Fair Value [Line Items]      
Netting [3] 0 0  
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Designated as Hedging Instrument | Interest Rate Swap | Cash Flow Hedges      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 17 1  
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Designated as Hedging Instrument | Interest Rate Swap | Level 1 | Cash Flow Hedges      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 0 0  
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Designated as Hedging Instrument | Interest Rate Swap | Level 2 | Cash Flow Hedges      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 17 1  
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Designated as Hedging Instrument | Interest Rate Swap | Level 3 | Cash Flow Hedges      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 0 0  
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 103 181  
Netting [3] (39) (98)  
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Level 1      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 16 43  
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Level 2      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 50 97  
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Level 3      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 37 41  
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Contract      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 103 181  
Netting [3] (39) (98)  
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Contract | Level 1      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 16 43  
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Contract | Level 2      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 50 97  
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Contract | Level 3      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 37 41  
Fair Value, Measurements, Nonrecurring | Purchased Power Agreements      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Net [4] 3 3  
Derivative Asset, Noncurrent [4] 0 3  
Derivative Liability, Net [4] 22 30  
Derivative Liability, Noncurrent [4] $ 8 $ 17  
[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] Xcel Energy nets derivative instruments and related collateral on its consolidated balance sheets when supported by a legally enforceable master netting agreement. At Dec. 31, 2023 and 2022, derivative assets and liabilities include no obligations to return cash collateral. At Dec. 31, 2023 and 2022, derivative assets and liabilities include rights to reclaim cash collateral of $7 million and $53 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.
[4] 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.