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Interest Rate Derivatives (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Derivative [Line Items]    
Derivative Asset, Current $ 179 $ 104
Derivative Liability, Noncurrent 68 86
Derivative Liability, Current 38 74
Fair Value, Measured on a Recurring Basis    
Derivative [Line Items]    
Derivative Asset, Current 178 101
Derivative Asset, Noncurrent 63 76
Derivative Liability, Gross 59 133
Netting [1] (27) (67)
Derivative Liability, Noncurrent 50 64
Derivative Liability, Current 32 66
Fair Value, Measured on a Recurring Basis | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 205 167
Netting [1] 27 66
Fair Value, Measured on a Recurring Basis | Other Noncurrent Assets    
Derivative [Line Items]    
Derivative Asset, Gross 84 110
Netting [1] 21 34
Fair Value, Measured on a Recurring Basis | Other Noncurrent Liabilities    
Derivative [Line Items]    
Derivative Liability, Gross 74 103
Netting [1] (24) (39)
Level 1 | Fair Value, Measured on a Recurring Basis    
Derivative [Line Items]    
Derivative Liability, Gross 6 6
Level 1 | Fair Value, Measured on a Recurring Basis | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 5 8
Level 1 | Fair Value, Measured on a Recurring Basis | Other Noncurrent Assets    
Derivative [Line Items]    
Derivative Asset, Gross 9 14
Level 1 | Fair Value, Measured on a Recurring Basis | Other Noncurrent Liabilities    
Derivative [Line Items]    
Derivative Liability, Gross 11 16
Level 2 | Fair Value, Measured on a Recurring Basis    
Derivative [Line Items]    
Derivative Liability, Gross 45 115
Level 2 | Fair Value, Measured on a Recurring Basis | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 39 65
Level 2 | Fair Value, Measured on a Recurring Basis | Other Noncurrent Assets    
Derivative [Line Items]    
Derivative Asset, Gross 32 51
Level 2 | Fair Value, Measured on a Recurring Basis | Other Noncurrent Liabilities    
Derivative [Line Items]    
Derivative Liability, Gross 29 50
Level 3 | Fair Value, Measured on a Recurring Basis    
Derivative [Line Items]    
Derivative Liability, Gross 8 12
Level 3 | Fair Value, Measured on a Recurring Basis | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 161 94
Level 3 | Fair Value, Measured on a Recurring Basis | Other Noncurrent Assets    
Derivative [Line Items]    
Derivative Asset, Gross 43 45
Level 3 | Fair Value, Measured on a Recurring Basis | Other Noncurrent Liabilities    
Derivative [Line Items]    
Derivative Liability, Gross 34 37
Commodity Trading | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments    
Derivative [Line Items]    
Derivative Asset, Current 11 32
Derivative Asset, Noncurrent 63 76
Derivative Liability, Gross 50 97
Netting [1] (25) (60)
Derivative Liability, Noncurrent 50 64
Derivative Liability, Current 25 37
Commodity Trading | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 36 91
Netting [1] 25 59
Commodity Trading | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Assets    
Derivative [Line Items]    
Derivative Asset, Gross 84 110
Netting [1] 21 34
Commodity Trading | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Liabilities    
Derivative [Line Items]    
Derivative Liability, Gross 74 103
Netting [1] (24) (39)
Commodity Trading | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments    
Derivative [Line Items]    
Derivative Liability, Gross 6 6
Commodity Trading | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 5 8
Commodity Trading | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Assets    
Derivative [Line Items]    
Derivative Asset, Gross 9 14
Commodity Trading | Level 1 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Liabilities    
Derivative [Line Items]    
Derivative Liability, Gross 11 16
Commodity Trading | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments    
Derivative [Line Items]    
Derivative Liability, Gross 38 86
Commodity Trading | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 21 51
Commodity Trading | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Assets    
Derivative [Line Items]    
Derivative Asset, Gross 32 51
Commodity Trading | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Liabilities    
Derivative [Line Items]    
Derivative Liability, Gross 29 50
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 10 32
Commodity Trading | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Assets    
Derivative [Line Items]    
Derivative Asset, Gross 43 45
Commodity Trading | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Noncurrent Liabilities    
Derivative [Line Items]    
Derivative Liability, Gross 34 37
Electric Commodity | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments    
Derivative [Line Items]    
Derivative Asset, Current 149 55
Derivative Liability, Gross 2 7
Netting [1] (2) (7)
Electric Commodity | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 151 62
Netting [1] 2 7
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 7
Electric Commodity | Level 3 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 151 62
Interest Rate Swap    
Derivative [Line Items]    
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net 1  
Derivative Liability, Notional Amount 0  
Interest Rate Swap | Fair Value, Measured on a Recurring Basis | Designated as Hedging Instrument    
Derivative [Line Items]    
Derivative Liability, Current   17
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 0 17
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 Liabilities | Cash Flow Hedges    
Derivative [Line Items]    
Derivative Liability, Gross 0 17
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 Asset, Current [2] 1 3
Derivative Liability, Noncurrent [2] 18 22
Derivative Liability, Current [2] 6 8
Natural Gas Commodity | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments    
Derivative [Line Items]    
Derivative Asset, Current 18 14
Derivative Liability, Gross 7 12
Netting [1] 0 0
Derivative Liability, Current 7 12
Natural Gas Commodity | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 18 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 7 12
Natural Gas Commodity | Level 2 | Fair Value, Measured on a Recurring Basis | Other Derivative Instruments | Other Current Assets    
Derivative [Line Items]    
Derivative Asset, Gross 18 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, 2024 and Dec. 31, 2023, derivative assets and liabilities include no obligations to return cash collateral. At Sept. 30, 2024 and Dec. 31, 2023, derivative assets and liabilities include rights to reclaim cash collateral of $3 million and $7 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.