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Recurring Fair Value Measurements (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Derivatives, Fair Value [Line Items]          
Reclaim Cash Collateral $ 5   $ 5   $ 2
Changes in Level 3 Commodity Derivatives [Roll Forward]          
Fair value hedges 0 $ 0 0 $ 0  
Return Cash Collateral 0   0   0
Derivative Liability, Current 27   27   37
Commodity Trading          
Changes in Level 3 Commodity Derivatives [Roll Forward]          
Balance at beginning of period 118 91 99 90  
Purchases [1] 194 174 260 177  
Settlements [1] (86) (110) (144) (161)  
Gains (losses) recognized in earnings [2] (6) 3 (8) 3  
Net gains recognized as regulatory assets and liabilities (a) [1] 23 81 36 130  
Balance at end of period 243 239 243 239  
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) (16) (15) (21) (3)  
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] (16) (15) (21) (3)  
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 0  
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 46   46   55
Netting [4] (25)   (25)   (24)
Changes in Level 3 Commodity Derivatives [Roll Forward]          
Derivative Asset, Current 255   255   114
Derivative Liability, Current 21   21   31
Fair Value Measured on a Recurring Basis | Level 1          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 8   8   7
Fair Value Measured on a Recurring Basis | Level 2          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 30   30   42
Fair Value Measured on a Recurring Basis | Level 3          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 8   8   6
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 43   43   47
Netting [4] (23)   (23)   (23)
Changes in Level 3 Commodity Derivatives [Roll Forward]          
Derivative Asset, Current 11   11   11
Derivative Liability, Current 20   20   24
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Electric Commodity          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 2   2   1
Netting [4] (2)   (2)   (1)
Changes in Level 3 Commodity Derivatives [Roll Forward]          
Derivative Asset, Current 241   241   89
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Natural Gas Commodity          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 1   1   7
Netting [4] 0   0   0
Changes in Level 3 Commodity Derivatives [Roll Forward]          
Derivative Asset, Current 3   3   14
Derivative Liability, Current 1   1   7
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 1 | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 8   8   7
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 29   29   35
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   7
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 2   2   1
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, Measurements, Nonrecurring | PPAs          
Changes in Level 3 Commodity Derivatives [Roll Forward]          
Derivative Liability, Current [5] $ 6   $ 6   $ 6
[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] 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, 2025 and Dec. 31, 2024, derivative assets and liabilities include no obligations to return cash collateral. At June 30, 2025 and Dec. 31, 2024, derivative assets and liabilities include rights to reclaim cash collateral of $5 million and $2 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.
[5] 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.