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Recurring Fair Value Measurements (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Derivatives, Fair Value [Line Items]      
Reclaim Cash Collateral $ 4   $ 2
Changes in Level 3 Commodity Derivatives [Roll Forward]      
Fair value hedges 0 $ 0  
Return Cash Collateral 0   0
Derivative Liability, Current 37   37
Commodity Trading      
Changes in Level 3 Commodity Derivatives [Roll Forward]      
Balance at beginning of period 99 90  
Purchases [1] 66 3  
Settlements [1] (57) (51)  
Gains (losses) recognized in earnings [2] (2) 0  
Net gains recognized as regulatory assets and liabilities (a) [1] 12 49  
Balance at end of period 118 91  
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) (5) 12  
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] (5) 12  
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) [4] 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  
Fair Value Measured on a Recurring Basis      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 64   55
Netting [5] (33)   (24)
Changes in Level 3 Commodity Derivatives [Roll Forward]      
Derivative Asset, Current 113   114
Derivative Liability, Current 31   31
Fair Value Measured on a Recurring Basis | Level 1      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 16   7
Fair Value Measured on a Recurring Basis | Level 2      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 40   42
Fair Value Measured on a Recurring Basis | Level 3      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 8   6
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Commodity Trading      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 59   47
Netting [5] (32)   (23)
Changes in Level 3 Commodity Derivatives [Roll Forward]      
Derivative Asset, Current 16   11
Derivative Liability, Current 27   24
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Electric Commodity      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 1   1
Netting [5] (1)   (1)
Changes in Level 3 Commodity Derivatives [Roll Forward]      
Derivative Asset, Current 96   89
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Natural Gas Commodity      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 0   7
Netting [5] 0   0
Changes in Level 3 Commodity Derivatives [Roll Forward]      
Derivative Asset, Current     14
Derivative Liability, Current     7
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 1 | Commodity Trading      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 16   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
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
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 2 | Commodity Trading      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 36   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
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 2 | Natural Gas Commodity      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 0   7
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 3 | Commodity Trading      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 7   5
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 3 | Electric Commodity      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 1   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
Fair Value Measured on a Recurring Basis | Designated as Hedging Instrument | Interest Rate Swap      
Changes in Level 3 Commodity Derivatives [Roll Forward]      
Derivative Asset, Current 1    
Derivative Liability, Current 4    
Fair Value, Measurements, Nonrecurring | PPAs      
Changes in Level 3 Commodity Derivatives [Roll Forward]      
Derivative Liability, Current [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] Other than $2 million of 2025 and 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 March 31, 2025 and Dec. 31, 2024, derivative assets and liabilities include no obligations to return cash collateral. At March 31, 2025 and Dec. 31, 2024, derivative assets and liabilities include rights to reclaim cash collateral of $4 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.
[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.