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Recurring Fair Value Measurements (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivatives, Fair Value [Line Items]      
Return Cash Collateral $ 0 $ 0  
Commodity Contract [Member]      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]      
Balance at beginning of period 12 14 $ 13
Purchases 23 27 32
Settlements (23) (34) (42)
Gains (losses) recognized as regulatory assets (5) 5 11
Balance at end of period 7 12 14
Transfers Between Levels, Net 0 0 $ 0
Other Current Assets      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Net 10 15  
Other Noncurrent Assets      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Net 9 13  
Other Current Liabilities      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Net 4 4  
Other Noncurrent Liabilities      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Net 9 13  
Fair Value Measured on a Recurring Basis | Other Current Assets      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 7 12  
Netting [1] 0 0  
Derivative Asset, Net 7 12  
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 1      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 0 0  
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 2      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 0 0  
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 3      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 7 12  
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Electric Commodity Contract      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 7 12  
Netting [1] 0 0  
Derivative Asset, Net 7 12  
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Electric Commodity Contract | Level 1      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 0 0  
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Electric Commodity Contract | Level 2      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 0 0  
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Electric Commodity Contract | Level 3      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Gross 7 12  
Fair Value, Measurements, Nonrecurring | Other Current Assets | Purchased Power Agreements      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Net [2] 3 3  
Fair Value, Measurements, Nonrecurring | Other Noncurrent Assets | Purchased Power Agreements      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Net [2] 9 13  
Fair Value, Measurements, Nonrecurring | Other Current Liabilities | Purchased Power Agreements      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Net [2] 4 4  
Fair Value, Measurements, Nonrecurring | Other Noncurrent Liabilities | Purchased Power Agreements      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Net [2] $ 9 $ 13  
[1] SPS nets derivative instruments and related collateral on its 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 Dec. 31, 2020 and 2019. At Dec. 31, 2020 and 2019, derivative assets and liabilities include no obligations to return cash collateral, respectively. At Dec. 31, 2020 and 2019, derivative assets and liabilities include no rights to reclaim cash collateral, respectively. The counterparty netting excludes settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.
[2] During 2006, SPS qualified these contracts under the normal purchase exception. Based on this qualification, the contracts are no longer adjusted to fair value and the previous carrying value of these contracts will be amortized over the remaining contract lives along with the offsetting regulatory assets and liabilities.