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Recurring Fair Value Measurements (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Derivatives, Fair Value [Line Items]          
Reclaim Cash Collateral $ 3   $ 3   $ 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 31   31   37
Commodity Trading          
Changes in Level 3 Commodity Derivatives [Roll Forward]          
Balance at beginning of period 243 239 99 90  
Purchases [1] 0 2 260 179  
Settlements [1] (66) (76) (209) (237)  
Gains (losses) recognized in earnings [2] (1) (9) (10) (6)  
Net gains recognized as regulatory assets and liabilities (a) [1] 11 6 47 136  
Balance at end of period 187 162 187 162  
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) (1) (13) (22) (16)  
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] (1) (13) (22) (16)  
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  
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] (21)   (21)   (24)
Changes in Level 3 Commodity Derivatives [Roll Forward]          
Derivative Asset, Current 216   216   114
Derivative Liability, Current 25   25   31
Fair Value Measured on a Recurring Basis | Level 1          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 6   6   7
Fair Value Measured on a Recurring Basis | Level 2          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 32   32   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 35   35   47
Netting [4] (19)   (19)   (23)
Changes in Level 3 Commodity Derivatives [Roll Forward]          
Derivative Asset, Current 9   9   11
Derivative Liability, Current 16   16   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 188   188   89
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Natural Gas Commodity          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 9   9   7
Netting [4] 0   0   0
Changes in Level 3 Commodity Derivatives [Roll Forward]          
Derivative Asset, Current 19   19   14
Derivative Liability, Current 9   9   7
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 1 | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 6   6   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 23   23   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 9   9   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 Sept. 30, 2025 and Dec. 31, 2024, derivative assets and liabilities include no obligations to return cash collateral. At Sept. 30, 2025 and Dec. 31, 2024, derivative assets and liabilities include rights to reclaim cash collateral of $3 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.