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Recurring Fair Value Measurements (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Derivatives, Fair Value [Line Items]          
Return Cash Collateral $ 32,000,000   $ 32,000,000   $ 32,000,000
Reclaim Cash Collateral 12,000,000   12,000,000   15,000,000
Commodity Trading          
Changes in Level 3 Commodity Derivatives [Roll Forward]          
Balance at beginning of period 28,000,000 $ 64,000,000 29,000,000 $ 35,000,000  
Purchases 5,000,000 3,000,000 42,000,000 49,000,000  
Settlements (21,000,000) (19,000,000) (48,000,000) (51,000,000)  
Gains (losses) recognized in earnings [1] 1,000,000 0 (9,000,000) 0  
Net gains recognized as regulatory assets and liabilities 2,000,000 0 1,000,000 15,000,000  
Balance at end of period 15,000,000 $ 48,000,000 15,000,000 $ 48,000,000  
Transfers Level 3, Net 0        
Other Current Assets          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Net 61,000,000   61,000,000   87,000,000
Other Noncurrent Assets          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Net 22,000,000   22,000,000   34,000,000
Other Current Liabilities          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Net 73,000,000   73,000,000   61,000,000
Other Noncurrent Liabilities          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Net 178,000,000   178,000,000   129,000,000
Fair Value Measured on a Recurring Basis | Other Current Assets          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 93,000,000   93,000,000   127,000,000
Netting [2] (35,000,000)   (35,000,000)   (44,000,000)
Derivative Asset, Net 58,000,000   58,000,000   83,000,000
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 1          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 3,000,000   3,000,000   4,000,000
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 2          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 49,000,000   49,000,000   96,000,000
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 3          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 41,000,000   41,000,000   27,000,000
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 58,000,000   58,000,000   98,000,000
Netting [2] (34,000,000)   (34,000,000)   (44,000,000)
Derivative Asset, Net 24,000,000   24,000,000   54,000,000
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Electric Commodity          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 28,000,000   28,000,000   25,000,000
Netting [2] (1,000,000)   (1,000,000)   0
Derivative Asset, Net 27,000,000   27,000,000   25,000,000
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 7,000,000   7,000,000   4,000,000
Netting [2] 0   0   0
Derivative Asset, Net 7,000,000   7,000,000   4,000,000
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 3,000,000   3,000,000   4,000,000
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 42,000,000   42,000,000   92,000,000
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 7,000,000   7,000,000   4,000,000
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 13,000,000   13,000,000   2,000,000
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 28,000,000   28,000,000   25,000,000
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 49,000,000   49,000,000   32,000,000
Netting [2] (41,000,000)   (41,000,000)   (14,000,000)
Derivative Asset, Net 8,000,000   8,000,000   18,000,000
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Level 1          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 5,000,000   5,000,000   0
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Level 2          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 39,000,000   39,000,000   27,000,000
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Level 3          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 5,000,000   5,000,000   5,000,000
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Gross 49,000,000   49,000,000   32,000,000
Netting [2] (41,000,000)   (41,000,000)   (14,000,000)
Derivative Asset, Net 8,000,000   8,000,000   18,000,000
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 5,000,000   5,000,000   0
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 39,000,000   39,000,000   27,000,000
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 5,000,000   5,000,000   5,000,000
Fair Value Measured on a Recurring Basis | Other Current Liabilities          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 103,000,000   103,000,000   101,000,000
Netting [2] (47,000,000)   (47,000,000)   (60,000,000)
Derivative Liability, Net 56,000,000   56,000,000   41,000,000
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Level 1          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 3,000,000   3,000,000   4,000,000
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Level 2          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 88,000,000   88,000,000   95,000,000
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Level 3          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 12,000,000   12,000,000   2,000,000
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 56,000,000   56,000,000   94,000,000
Netting [2] (46,000,000)   (46,000,000)   (60,000,000)
Derivative Liability, Net 10,000,000   10,000,000   34,000,000
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Electric Commodity          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 1,000,000   1,000,000   0
Netting [2] (1,000,000)   (1,000,000)   0
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 6,000,000   6,000,000   0
Netting [2] 0   0   0
Derivative Liability, Net 6,000,000   6,000,000   0
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 3,000,000   3,000,000   4,000,000
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 42,000,000   42,000,000   88,000,000
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 6,000,000   6,000,000   0
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 11,000,000   11,000,000   2,000,000
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 1,000,000   1,000,000   0
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 Current Liabilities | Designated as Hedging Instrument | Interest Rate Swap          
Derivatives, Fair Value [Line Items]          
Netting [2] 0   0   0
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Designated as Hedging Instrument | Cash Flow Hedges | Interest Rate Swap          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 40,000,000   40,000,000   7,000,000
Derivative Liability, Net 40,000,000   40,000,000   7,000,000
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Designated as Hedging Instrument | Level 1 | Cash Flow Hedges | Interest Rate Swap          
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 | Cash Flow Hedges | Interest Rate Swap          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 40,000,000   40,000,000   7,000,000
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Designated as Hedging Instrument | Level 3 | Cash Flow Hedges | Interest Rate Swap          
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 109,000,000   109,000,000   19,000,000
Netting [2] (10,000,000)   (10,000,000)   (17,000,000)
Derivative Liability, Net 99,000,000   99,000,000   36,000,000
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Level 1          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 2,000,000   2,000,000   0
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Level 2          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 88,000,000   88,000,000   18,000,000
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Level 3          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 19,000,000   19,000,000   1,000,000
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Trading          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Gross 109,000,000   109,000,000   19,000,000
Netting [2] (10,000,000)   (10,000,000)   (17,000,000)
Derivative Liability, Net 99,000,000   99,000,000   36,000,000
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 2,000,000   2,000,000   0
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 88,000,000   88,000,000   18,000,000
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 19,000,000   19,000,000   1,000,000
Fair Value, Measurements, Nonrecurring | Other Current Assets | PPAs          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Net [3] 3,000,000   3,000,000   4,000,000
Fair Value, Measurements, Nonrecurring | Other Noncurrent Assets | PPAs          
Derivatives, Fair Value [Line Items]          
Derivative Asset, Net [3] 14,000,000   14,000,000   16,000,000
Fair Value, Measurements, Nonrecurring | Other Current Liabilities | PPAs          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Net [3] 17,000,000   17,000,000   20,000,000
Fair Value, Measurements, Nonrecurring | Other Noncurrent Liabilities | PPAs          
Derivatives, Fair Value [Line Items]          
Derivative Liability, Net [3] $ 79,000,000   $ 79,000,000   $ 93,000,000
[1]
(a) 
These amounts relate to commodity derivatives held at the end of the period.
[2]
Xcel Energy nets derivative instruments and related collateral in its consolidated balance sheet 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, 2019 and Dec. 31, 2018. At both Sept. 30, 2019 and Dec. 31, 2018, derivative assets and liabilities include $32 million of obligations to return cash collateral. At Sept. 30, 2019 and Dec. 31, 2018, derivative assets and liabilities include rights to reclaim cash collateral of $12 million and $15 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.