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Interest Rate Derivatives (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Derivative [Line Items]    
Derivative Liability, Noncurrent $ 72 $ 77
Derivative Liability, Current 37 37
Fair Value, Measured on a Recurring Basis    
Derivative [Line Items]    
Derivative Asset, Current 113 114
Derivative Asset, Noncurrent 73 72
Derivative Liability, Gross 64 55
Netting [1] (33) (24)
Derivative Liability, Noncurrent 57 61
Derivative Liability, Current 31 31
Fair Value, Measured on a Recurring Basis | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 145 138
Netting [1] 32 24
Fair Value, Measured on a Recurring Basis | Other Noncurrent Assets    
Derivative [Line Items]    
Derivative Asset, Gross 95 92
Netting [1] 22 20
Fair Value, Measured on a Recurring Basis | Other Noncurrent Liabilities    
Derivative [Line Items]    
Derivative Liability, Gross 82 83
Netting [1] (25) (22)
Level 1 | Fair Value, Measured on a Recurring Basis    
Derivative [Line Items]    
Derivative Liability, Gross 16 7
Level 1 | Fair Value, Measured on a Recurring Basis | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 14 6
Level 1 | Fair Value, Measured on a Recurring Basis | Other Noncurrent Assets    
Derivative [Line Items]    
Derivative Asset, Gross 11 8
Level 1 | Fair Value, Measured on a Recurring Basis | Other Noncurrent Liabilities    
Derivative [Line Items]    
Derivative Liability, Gross 12 11
Level 2 | Fair Value, Measured on a Recurring Basis    
Derivative [Line Items]    
Derivative Liability, Gross 40 42
Level 2 | Fair Value, Measured on a Recurring Basis | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 23 34
Level 2 | Fair Value, Measured on a Recurring Basis | Other Noncurrent Assets    
Derivative [Line Items]    
Derivative Asset, Gross 30 37
Level 2 | Fair Value, Measured on a Recurring Basis | Other Noncurrent Liabilities    
Derivative [Line Items]    
Derivative Liability, Gross 34 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 108 98
Level 3 | Fair Value, Measured on a Recurring Basis | Other Noncurrent Assets    
Derivative [Line Items]    
Derivative Asset, Gross 54 47
Level 3 | Fair Value, Measured on a Recurring Basis | Other Noncurrent Liabilities    
Derivative [Line Items]    
Derivative Liability, Gross 36 40
Commodity Trading | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments    
Derivative [Line Items]    
Derivative Asset, Current 16 11
Derivative Asset, Noncurrent 59 72
Derivative Liability, Gross 59 47
Netting [1] (32) (23)
Derivative Liability, Noncurrent 57 61
Derivative Liability, Current 27 24
Commodity Trading | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 48 34
Netting [1] 32 23
Commodity Trading | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Assets    
Derivative [Line Items]    
Derivative Asset, Gross 81 92
Netting [1] 22 20
Commodity Trading | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Liabilities    
Derivative [Line Items]    
Derivative Liability, Gross 82 83
Netting [1] (25) (22)
Commodity Trading | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments    
Derivative [Line Items]    
Derivative Liability, Gross 16 7
Commodity Trading | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 14 6
Commodity Trading | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Assets    
Derivative [Line Items]    
Derivative Asset, Gross 11 8
Commodity Trading | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Liabilities    
Derivative [Line Items]    
Derivative Liability, Gross 12 11
Commodity Trading | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments    
Derivative [Line Items]    
Derivative Liability, Gross 36 35
Commodity Trading | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 22 20
Commodity Trading | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Assets    
Derivative [Line Items]    
Derivative Asset, Gross 30 37
Commodity Trading | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Liabilities    
Derivative [Line Items]    
Derivative Liability, Gross 34 32
Commodity Trading | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments    
Derivative [Line Items]    
Derivative Liability, Gross 7 5
Commodity Trading | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 12 8
Commodity Trading | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Assets    
Derivative [Line Items]    
Derivative Asset, Gross 40 47
Commodity Trading | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Liabilities    
Derivative [Line Items]    
Derivative Liability, Gross 36 40
Electric Commodity | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments    
Derivative [Line Items]    
Derivative Asset, Current 96 89
Derivative Asset, Noncurrent 14 0
Derivative Liability, Gross 1 1
Netting [1] (1) (1)
Electric Commodity | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 96 90
Netting [1] 0 1
Electric Commodity | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Assets    
Derivative [Line Items]    
Derivative Asset, Gross 14 0
Netting 0 0
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 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent 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 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent 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 1 1
Electric Commodity | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 96 90
Electric Commodity | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Assets    
Derivative [Line Items]    
Derivative Asset, Gross 14 0
Interest Rate Swap    
Derivative [Line Items]    
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net 3  
Derivative Liability, Notional Amount 390  
Interest Rate Swap | Fair Value, Measured on a Recurring Basis | Designated as Hedging Instrument    
Derivative [Line Items]    
Derivative Asset, Current 1  
Derivative Liability, Current 4  
Interest Rate Swap | Fair Value, Measured on a Recurring Basis | Designated as Hedging Instrument | Other Current Assets    
Derivative [Line Items]    
Netting 0 0
Interest Rate Swap | Fair Value, Measured on a Recurring Basis | Designated as Hedging Instrument | Other Current Assets | Cash Flow Hedges    
Derivative [Line Items]    
Derivative Liability, Gross 1 0
Interest Rate Swap | Fair Value, Measured on a Recurring Basis | Designated as Hedging Instrument | Other Current Liabilities    
Derivative [Line Items]    
Netting [1] 0 0
Interest Rate Swap | Fair Value, Measured on a Recurring Basis | Designated as Hedging Instrument | Other Current Liabilities | Cash Flow Hedges    
Derivative [Line Items]    
Derivative Liability, Gross 4 0
Interest Rate Swap | Level 1 | Fair Value, Measured on a Recurring Basis | Designated as Hedging Instrument | Other Current Assets | Cash Flow Hedges    
Derivative [Line Items]    
Derivative Liability, Gross 0 0
Interest Rate Swap | Level 1 | Fair Value, Measured on a Recurring Basis | Designated as Hedging Instrument | Other Current Liabilities | Cash Flow Hedges    
Derivative [Line Items]    
Derivative Liability, Gross 0 0
Interest Rate Swap | Level 2 | Fair Value, Measured on a Recurring Basis | Designated as Hedging Instrument | Other Current Assets | Cash Flow Hedges    
Derivative [Line Items]    
Derivative Liability, Gross 1 0
Interest Rate Swap | Level 2 | Fair Value, Measured on a Recurring Basis | Designated as Hedging Instrument | Other Current Liabilities | Cash Flow Hedges    
Derivative [Line Items]    
Derivative Liability, Gross 4 0
Interest Rate Swap | Level 3 | Fair Value, Measured on a Recurring Basis | Designated as Hedging Instrument | Other Current Assets | Cash Flow Hedges    
Derivative [Line Items]    
Derivative Liability, Gross 0 0
Interest Rate Swap | Level 3 | Fair Value, Measured on a Recurring Basis | Designated as Hedging Instrument | Other Current Liabilities | Cash Flow Hedges    
Derivative [Line Items]    
Derivative Liability, Gross 0 0
PPAs | Fair Value, Measurements, Nonrecurring    
Derivative [Line Items]    
Derivative Liability, Noncurrent [2] 15 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   14
Derivative Liability, Gross 0 7
Netting [1] 0 0
Derivative Liability, Current   7
Natural Gas Commodity | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 0 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 0 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 0 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 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.
[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.