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Interest Rate Derivatives (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Derivative [Line Items]    
Derivative Liability, Noncurrent $ 69 $ 77
Derivative Liability, Current 31 37
Fair Value, Measured on a Recurring Basis    
Derivative [Line Items]    
Derivative Asset, Current 216 114
Derivative Asset, Noncurrent 56 72
Derivative Liability, Gross 46 55
Netting [1] (21) (24)
Derivative Liability, Noncurrent 58 61
Derivative Liability, Current 25 31
Fair Value, Measured on a Recurring Basis | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 236 138
Netting [1] 20 24
Fair Value, Measured on a Recurring Basis | Other Noncurrent Assets    
Derivative [Line Items]    
Derivative Asset, Gross 69 92
Netting [1] 13 20
Fair Value, Measured on a Recurring Basis | Other Noncurrent Liabilities    
Derivative [Line Items]    
Derivative Liability, Gross 73 83
Netting [1] (15) (22)
Level 1 | Fair Value, Measured on a Recurring Basis    
Derivative [Line Items]    
Derivative Liability, Gross 6 7
Level 1 | Fair Value, Measured on a Recurring Basis | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 4 6
Level 1 | Fair Value, Measured on a Recurring Basis | Other Noncurrent Assets    
Derivative [Line Items]    
Derivative Asset, Gross 3 8
Level 1 | Fair Value, Measured on a Recurring Basis | Other Noncurrent Liabilities    
Derivative [Line Items]    
Derivative Liability, Gross 8 11
Level 2 | Fair Value, Measured on a Recurring Basis    
Derivative [Line Items]    
Derivative Liability, Gross 32 42
Level 2 | Fair Value, Measured on a Recurring Basis | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 34 34
Level 2 | Fair Value, Measured on a Recurring Basis | Other Noncurrent Assets    
Derivative [Line Items]    
Derivative Asset, Gross 29 37
Level 2 | Fair Value, Measured on a Recurring Basis | Other Noncurrent Liabilities    
Derivative [Line Items]    
Derivative Liability, Gross 25 32
Level 3 | Fair Value, Measured on a Recurring Basis    
Derivative [Line Items]    
Derivative Liability, Gross 8 6
Level 3 | Fair Value, Measured on a Recurring Basis | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 198 98
Level 3 | Fair Value, Measured on a Recurring Basis | Other Noncurrent Assets    
Derivative [Line Items]    
Derivative Asset, Gross 37 47
Level 3 | Fair Value, Measured on a Recurring Basis | Other Noncurrent Liabilities    
Derivative [Line Items]    
Derivative Liability, Gross 40 40
Commodity Trading | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments    
Derivative [Line Items]    
Derivative Asset, Current 9 11
Derivative Asset, Noncurrent 56 72
Derivative Liability, Gross 35 47
Netting [1] (19) (23)
Derivative Liability, Noncurrent 58 61
Derivative Liability, Current 16 24
Commodity Trading | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 27 34
Netting [1] 18 23
Commodity Trading | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Assets    
Derivative [Line Items]    
Derivative Asset, Gross 69 92
Netting [1] 13 20
Commodity Trading | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Liabilities    
Derivative [Line Items]    
Derivative Liability, Gross 73 83
Netting [1] (15) (22)
Commodity Trading | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments    
Derivative [Line Items]    
Derivative Liability, Gross 6 7
Commodity Trading | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 4 6
Commodity Trading | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Assets    
Derivative [Line Items]    
Derivative Asset, Gross 3 8
Commodity Trading | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Liabilities    
Derivative [Line Items]    
Derivative Liability, Gross 8 11
Commodity Trading | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments    
Derivative [Line Items]    
Derivative Liability, Gross 23 35
Commodity Trading | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 15 20
Commodity Trading | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Assets    
Derivative [Line Items]    
Derivative Asset, Gross 29 37
Commodity Trading | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Liabilities    
Derivative [Line Items]    
Derivative Liability, Gross 25 32
Commodity Trading | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments    
Derivative [Line Items]    
Derivative Liability, Gross 6 5
Commodity Trading | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 8 8
Commodity Trading | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Assets    
Derivative [Line Items]    
Derivative Asset, Gross 37 47
Commodity Trading | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Liabilities    
Derivative [Line Items]    
Derivative Liability, Gross 40 40
Electric Commodity | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments    
Derivative [Line Items]    
Derivative Asset, Current 188 89
Derivative Liability, Gross 2 1
Netting [1] (2) (1)
Electric Commodity | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 190 90
Netting [1] 2 1
Electric Commodity | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments    
Derivative [Line Items]    
Derivative Liability, Gross 0 0
Electric Commodity | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 0 0
Electric Commodity | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments    
Derivative [Line Items]    
Derivative Liability, Gross 0 0
Electric Commodity | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 0 0
Electric Commodity | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments    
Derivative [Line Items]    
Derivative Liability, Gross 2 1
Electric Commodity | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 190 90
Interest Rate Swap    
Derivative [Line Items]    
Derivative Liability, Notional Amount 120  
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net 3  
PPAs | Fair Value, Measurements, Nonrecurring    
Derivative [Line Items]    
Derivative Liability, Noncurrent [2] 11 16
Derivative Liability, Current [2] 6 6
Natural Gas Commodity | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments    
Derivative [Line Items]    
Derivative Asset, Current 19 14
Derivative Liability, Gross 9 7
Netting [1] 0 0
Derivative Liability, Current 9 7
Natural Gas Commodity | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 19 14
Netting [1] 0 0
Natural Gas Commodity | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments    
Derivative [Line Items]    
Derivative Liability, Gross 0 0
Natural Gas Commodity | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 0 0
Natural Gas Commodity | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments    
Derivative [Line Items]    
Derivative Liability, Gross 9 7
Natural Gas Commodity | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 19 14
Natural Gas Commodity | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments    
Derivative [Line Items]    
Derivative Liability, Gross 0 0
Natural Gas Commodity | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross $ 0 $ 0
[1] 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.
[2] 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.