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Recurring Fair Value Measurements (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Derivatives, Fair Value [Line Items]          
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Current   Other Liabilities, Current   Other Liabilities, Current
Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Noncurrent   Other Liabilities, Noncurrent   Other Liabilities, Noncurrent
Return Cash Collateral $ 0   $ 0   $ 0
Reclaim Cash Collateral 19   19   53
Commodity Trading          
Changes in Level 3 Commodity Derivatives [Roll Forward]          
Balance at beginning of period 78 $ 39 235 $ 19  
Purchases [1] 167 390 172 394  
Settlements [1] (47) (155) (76) (181)  
Gains (losses) recognized in earnings [2] 10 78 (2) 120  
Net gains recognized as regulatory assets and liabilities (a) [1] 1 133 (120) 133  
Balance at end of period 209 $ 485 209 $ 485  
Fair Value Measured on a Recurring Basis          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 185   185   348
Netting [3] $ (137)   $ (137)   $ (289)
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Current   Other Liabilities, Current   Other Liabilities, Current
Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Noncurrent   Other Liabilities, Noncurrent   Other Liabilities, Noncurrent
Fair Value Measured on a Recurring Basis | Level 1          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross $ 9   $ 9   $ 29
Fair Value Measured on a Recurring Basis | Level 2          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 168   168   311
Fair Value Measured on a Recurring Basis | Level 3          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 8   8   8
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 183   183   332
Netting [3] $ (135)   $ (135)   $ (287)
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Current   Other Liabilities, Current   Other Liabilities, Current
Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Noncurrent   Other Liabilities, Noncurrent   Other Liabilities, Noncurrent
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Electric Commodity          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross $ 2   $ 2   $ 2
Netting [3] $ (2)   $ (2)   $ (2)
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Current   Other Liabilities, Current   Other Liabilities, Current
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Natural Gas Commodity          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross $ 0   $ 0   $ 13
Netting [3] $ 0   $ 0   $ 0
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Current   Other Liabilities, Current   Other Liabilities, Current
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 1 | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross $ 9   $ 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   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   0
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 2 | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 168   168   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   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   0   13
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 3 | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 6   6   6
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 3 | Electric Commodity          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 2   2   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   $ 0
Fair Value Measured on a Recurring Basis | Designated as Hedging Instrument | Interest Rate Swap | Cash Flow Hedges          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Liabilities, Current   Other Liabilities, Current   Other Liabilities, Current
Fair Value Measured on a Recurring Basis | Other Current Assets          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross $ 348   $ 348   $ 520
Netting [3] (118)   (118)   (244)
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 1          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 10   10   32
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 2          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 146   146   278
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 3          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 192   192   210
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 178   178   324
Netting [3] (116)   (116)   (242)
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Electric Commodity          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 158   158   177
Netting [3] (2)   (2)   (2)
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 4   4   19
Netting [3] 0   0   0
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 10   10   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   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 134   134   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   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 4   4   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 34   34   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 158   158   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   0
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 140   140   179
Netting [3] (62)   (62)   (89)
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Level 1          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 19   19   34
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Level 2          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 53   53   71
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Level 3          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 68   68   74
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 140   140   179
Netting [3] (62)   (62)   (89)
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 19   19   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 53   53   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 68   68   74
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Designated as Hedging Instrument | Interest Rate Swap          
Derivatives, Fair Value [Line Items]          
Netting [3] 0   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 0   0   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   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 0   0   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   0
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 135   135   181
Netting [3] (62)   (62)   (98)
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Level 1          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 22   22   43
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Level 2          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 70   70   97
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Level 3          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 43   43   41
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 135   135   181
Netting [3] (62)   (62)   (98)
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   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 70   70   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 $ 43   $ 43   $ 41
Fair Value, Measurements, Nonrecurring | PPAs          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration] [4] Other Liabilities, Current   Other Liabilities, Current   Other Liabilities, Current
Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] [4] Other Liabilities, Noncurrent   Other Liabilities, Noncurrent   Other Liabilities, Noncurrent
[1] Relates primarily to NSP-Minnesota and SPS FTR instruments administered by MISO and SPP.
[2] Relates to commodity trading and is subject to substantial offsetting losses and gains on derivative instruments categorized as levels 1 and 2 in the income statement. See above tables for the income statement impact of derivative activity, including commodity trading gains and losses.
[3] Xcel Energy nets derivative instruments and related collateral on its consolidated balance sheets when supported by a legally enforceable master netting agreement. At June 30, 2023 and Dec. 31, 2022, derivative assets and liabilities include no obligations to return cash collateral. At June 30, 2023 and Dec. 31, 2022, derivative assets and liabilities include rights to reclaim cash collateral of $19 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.
[4] 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.