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Recurring Fair Value Measurements (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Derivatives, Fair Value [Line Items]      
Return Cash Collateral $ 0   $ 0
Reclaim Cash Collateral 29   53
Commodity Trading      
Changes in Level 3 Commodity Derivatives [Roll Forward]      
Balance at beginning of period 235 $ 19  
Purchases 6 5  
Settlements (29) (50)  
Gains (losses) recognized in earnings (13) 42  
Net gains recognized as regulatory assets and liabilities (a) (121) 24  
Balance at end of period 78 $ 40  
Other Current Assets      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Net 97   279
Other Noncurrent Assets      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Net 97   93
Other Current Liabilities      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Net 62   76
Other Noncurrent Liabilities      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Net 116   113
Fair Value Measured on a Recurring Basis      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 200   348
Netting [1] (154)   (289)
Derivative Liability, Net 46   59
Fair Value Measured on a Recurring Basis | Level 1      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 9   29
Fair Value Measured on a Recurring Basis | Level 2      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 186   311
Fair Value Measured on a Recurring Basis | Level 3      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 5   8
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Commodity Trading      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 193   332
Netting [1] (153)   (287)
Derivative Liability, Net 40   45
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Electric Commodity      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 1   2
Netting [1] (1)   (2)
Derivative Liability, Net 0   0
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Natural Gas Commodity      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 0   13
Netting [1] 0   0
Derivative Liability, Net 0   13
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 1 | Commodity Trading      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 9   29
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 180   297
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   13
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 3 | Commodity Trading      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 4   6
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 3 | Electric Commodity      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 1   2
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 | Cash Flow Hedges      
Changes in Level 3 Commodity Derivatives [Roll Forward]      
Derivative Liability, Current 6   1
Fair Value Measured on a Recurring Basis | Other Current Assets      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 218   520
Netting [1] (124)   (244)
Derivative Asset, Net 94   276
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 1      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 11   32
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 2      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 152   278
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 3      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 55   210
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Commodity Trading      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 184   324
Netting [1] (124)   (242)
Derivative Asset, Net 60   82
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Electric Commodity      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 34   177
Netting [1] 0   (2)
Derivative Asset, Net 34   175
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 0   19
Netting [1] 0   0
Derivative Asset, Net 0   19
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Level 1 | Commodity Trading      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 11   32
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Level 1 | Electric Commodity      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 0   0
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Level 1 | Natural Gas Commodity      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 0   0
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Level 2 | Commodity Trading      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 152   259
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Level 2 | Electric Commodity      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 0   0
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Level 2 | Natural Gas Commodity      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 0   19
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Level 3 | Commodity Trading      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 21   33
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Level 3 | Electric Commodity      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 34   177
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Level 3 | Natural Gas Commodity      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 0   0
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 164   179
Netting [1] (69)   (89)
Derivative Asset, Net 95   90
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Level 1      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 24   34
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Level 2      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 62   71
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Level 3      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 78   74
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Commodity Trading      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 164   179
Netting [1] (69)   (89)
Derivative Asset, Net 95   90
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Level 1 | Commodity Trading      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 24   34
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Level 2 | Commodity Trading      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 62   71
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Level 3 | Commodity Trading      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 78   74
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Designated as Hedging Instrument | Interest Rate Swap      
Derivatives, Fair Value [Line Items]      
Netting [1] 0   0
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Designated as Hedging Instrument | Interest Rate Swap | Cash Flow Hedges      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 6   1
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Designated as Hedging Instrument | Level 1 | Interest Rate Swap | Cash Flow Hedges      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 0   0
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Designated as Hedging Instrument | Level 2 | Interest Rate Swap | Cash Flow Hedges      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 6   1
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Designated as Hedging Instrument | Level 3 | Interest Rate Swap | Cash Flow Hedges      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 0   0
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 157   181
Netting [1] (69)   (98)
Derivative Liability, Net 88   83
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Level 1      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 30   43
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Level 2      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 77   97
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Level 3      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 50   41
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Trading      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 157   181
Netting [1] (69)   (98)
Derivative Liability, Net 88   83
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Other Derivative Instruments | Level 1 | Commodity Trading      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 30   43
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Other Derivative Instruments | Level 2 | Commodity Trading      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 77   97
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Other Derivative Instruments | Level 3 | Commodity Trading      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Gross 50   41
Fair Value, Measurements, Nonrecurring | Other Current Assets | PPAs      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Net [2] 3   3
Fair Value, Measurements, Nonrecurring | Other Noncurrent Assets | PPAs      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Net [2] 2   3
Fair Value, Measurements, Nonrecurring | Other Current Liabilities | PPAs      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Net [2] 16   17
Fair Value, Measurements, Nonrecurring | Other Noncurrent Liabilities | PPAs      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Net [2] $ 28   $ 30
[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, 2023 and Dec. 31, 2022, derivative assets and liabilities include no obligations to return cash collateral. At March 31, 2023 and Dec. 31, 2022, derivative assets and liabilities include rights to reclaim cash collateral of $29 million and $53 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.