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Recurring Fair Value Measurements (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Derivatives, Fair Value [Line Items]          
Return Cash Collateral $ 15   $ 15   $ 15
Reclaim Cash Collateral 42   42   6
Commodity Trading          
Changes in Level 3 Commodity Derivatives [Roll Forward]          
Balance at beginning of period 71 $ 34 (49) $ 4  
Purchases 2 0 65 49  
Settlements (53) (17) (101) (59)  
Gains (losses) recognized in earnings [1] 12 (25) 59 (11)  
Net gains recognized as regulatory assets and liabilities 27 2 85 11  
Balance at end of period 59 (6) 59 (6)  
Transfers Level 3, Net 0 $ 0 0 $ 0  
Other Current Assets          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Net 228   228   49
Other Noncurrent Assets          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Net 72   72   30
Other Current Liabilities          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Net 76   76   53
Other Noncurrent Liabilities          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Net 99   99   131
Fair Value Measured on a Recurring Basis | Other Current Assets          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 479   479   99
Netting [2] (254)   (254)   (53)
Derivative Asset, Net 225   225   46
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 1          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 50   50   2
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 2          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 323   323   76
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 3          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 106   106   21
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 313   313   70
Netting [2] (253)   (253)   (52)
Derivative Asset, Net 60   60   18
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Electric Commodity          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 83   83   20
Netting [2] (1)   (1)   (1)
Derivative Asset, Net 82   82   19
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 79   79   9
Netting [2] 0   0   0
Derivative Asset, Net 79   79   9
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 50   50   2
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   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   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 240   240   67
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   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 79   79   9
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 23   23   1
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 83   83   20
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   0
Fair Value Measured on a Recurring Basis | Other Current Assets | Designated as Hedging Instrument | Interest Rate Swap          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 4   4   0
Netting [2] 0   0   0
Derivative Asset, Net 4   4   0
Fair Value Measured on a Recurring Basis | Other Current Assets | Designated as Hedging Instrument | Level 1 | Interest Rate Swap          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 0   0   0
Fair Value Measured on a Recurring Basis | Other Current Assets | Designated as Hedging Instrument | Level 2 | Interest Rate Swap          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 4   4   0
Fair Value Measured on a Recurring Basis | Other Current Assets | Designated as Hedging Instrument | Level 3 | Interest Rate Swap          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 0   0   0
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 194   194   82
Netting [2] (129)   (129)   (62)
Derivative Asset, Net 65   65   20
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Level 1          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 23   23   8
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Level 2          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 72   72   66
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Level 3          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 99   99   8
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 194   194   82
Netting [2] (129)   (129)   (62)
Derivative Asset, Net 65   65   20
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 23   23   8
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 72   72   66
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 99   99   8
Fair Value Measured on a Recurring Basis | Other Current Liabilities          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 313   313   95
Netting [2] (254)   (254)   (59)
Derivative Liability, Net 59   59   36
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Level 1          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 48   48   4
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Level 2          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 239   239   73
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Level 3          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 26   26   18
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 312   312   85
Netting [2] (253)   (253)   (58)
Derivative Liability, Net 59   59   27
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Electric Commodity          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 1   1   1
Netting [2] (1)   (1)   (1)
Derivative Liability, Net 0   0   0
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Natural Gas Commodity          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 0   0   9
Netting [2] 0   0   0
Derivative Liability, Net 0   0   9
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Level 1 | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 48   48   4
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Level 1 | Electric Commodity          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 0   0   0
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Level 1 | Natural Gas Commodity          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 0   0   0
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Level 2 | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 239   239   64
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Level 2 | Electric Commodity          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 0   0   0
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Level 2 | Natural Gas Commodity          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 0   0   9
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Level 3 | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 25   25   17
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Level 3 | Electric Commodity          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 1   1   1
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Level 3 | Natural Gas Commodity          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 0   0   0
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 211   211   121
Netting [2] (156)   (156)   (47)
Derivative Liability, Net 55   55   74
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Level 1          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 22   22   3
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Level 2          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 69   69   58
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Level 3          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 120   120   60
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 211   211   121
Netting [2] (156)   (156)   (47)
Derivative Liability, Net 55   55   74
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 22   22   3
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 69   69   58
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 120   120   60
Fair Value, Measurements, Nonrecurring | Other Current Assets | PPAs          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Net [3] 3   3   3
Fair Value, Measurements, Nonrecurring | Other Noncurrent Assets | PPAs          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Net [3] 7   7   10
Fair Value, Measurements, Nonrecurring | Other Current Liabilities | PPAs          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Net [3] 17   17   17
Fair Value, Measurements, Nonrecurring | Other Noncurrent Liabilities | PPAs          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Net [3] $ 44   $ 44   $ 57
[1] Presented amounts relate to instruments held at the end of the period. The consolidated income statement also includes gains and losses on Level 1 and 2 instruments, and Level 3 instruments settled during the period
[2] Xcel Energy nets derivative instruments and related collateral on its consolidated balance sheets when supported by a legally enforceable master netting agreement, and all derivative instruments and related collateral amounts were subject to master netting agreements at Sept. 30, 2021 and Dec. 31, 2020. At both Sept. 30, 2021 and Dec. 31, 2020, derivative assets and liabilities include $15 million of obligations to return cash collateral. At Sept. 30, 2021 and Dec. 31, 2020, derivative assets and liabilities include rights to reclaim cash collateral of $42 million and $6 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.
[3] During 2006, Xcel Energy qualified these contracts under the normal purchase exception. Based on this qualification, contracts are no longer adjusted to fair value and the previous carrying value of these contracts is being amortized over the remaining contract lives along with the offsetting regulatory assets and liabilities.