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Recurring Fair Value Measurements (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 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
Reclaim Cash Collateral $ 12   $ 12   $ 53
Changes in Level 3 Commodity Derivatives [Roll Forward]          
Fair value hedges 0 $ 0 0 $ 0  
Commodity Trading          
Changes in Level 3 Commodity Derivatives [Roll Forward]          
Balance at beginning of period 209 485 236 19  
Purchases [1] 1 4 173 398  
Settlements [1] (50) (106) (126) (286)  
Gains (losses) recognized in earnings [2] 18 16 16 136  
Net (losses) gains recognized as regulatory assets and liabilities (a) [1] (36) 3 (157) 135  
Balance at end of period 142 $ 402 142 $ 402  
Fair Value Measured on a Recurring Basis          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 136   136   348
Netting [3] $ (94)   $ (94)   $ (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 $ 8   $ 8   $ 29
Fair Value Measured on a Recurring Basis | Level 2          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 117   117   311
Fair Value Measured on a Recurring Basis | Level 3          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 11   11   8
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 132   132   332
Netting [3] $ (90)   $ (90)   $ (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 $ 4   $ 4   $ 2
Netting [3] $ (4)   $ (4)   $ (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 $ 8   $ 8   $ 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 117   117   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 7   7   6
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 3 | Electric Commodity          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 4   4   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 $ 233   $ 233   $ 520
Netting [3] (90)   (90)   (244)
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 1          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 8   8   32
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 2          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 87   87   278
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 3          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 138   138   210
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 127   127   324
Netting [3] (86)   (86)   (242)
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Electric Commodity          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 99   99   177
Netting [3] (4)   (4)   (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 7   7   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 8   8   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 80   80   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 7   7   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 39   39   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 99   99   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 111   111   179
Netting [3] (40)   (40)   (89)
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Level 1          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 18   18   34
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Level 2          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 36   36   71
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Level 3          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 57   57   74
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 111   111   179
Netting [3] (40)   (40)   (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 18   18   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 36   36   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 57   57   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 105   105   181
Netting [3] (46)   (46)   (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 41   41   97
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Level 3          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 42   42   41
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 105   105   181
Netting [3] (46)   (46)   (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 41   41   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 $ 42   $ 42   $ 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 Sept. 30, 2023 and Dec. 31, 2022, derivative assets and liabilities include no obligations to return cash collateral. At Sept. 30, 2023 and Dec. 31, 2022, derivative assets and liabilities include rights to reclaim cash collateral of $12 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.