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Fair Value of Financial Assets and Liabilities - Recurring Fair Value Measurements (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Derivatives, Fair Value          
Return Cash Collateral $ 0   $ 0   $ 0
Reclaim Cash Collateral 0   0   0
Commodity Contract [Member]          
Changes in Level 3 Commodity Derivatives          
Balance at beginning of period 12 $ 16 7 $ 12  
Purchases 9 9 9 21  
Settlements (12) (12) (21) (17)  
Net gains recognized as regulatory assets and liabilities 32 3 46 0  
Balance at end of period 41 16 41 16  
Transfers Level 3, Net 0 $ 0 0 $ 0  
Other Current Assets          
Derivatives, Fair Value          
Derivative asset, net 44   44   10
Other Noncurrent Assets          
Derivatives, Fair Value          
Derivative asset, net 8   8   9
Other Current Liabilities          
Derivatives, Fair Value          
Derivative liability, net 4   4   4
Other Noncurrent Liabilities          
Derivatives, Fair Value          
Derivative liability, net 7   7   9
Fair Value Measured on a Recurring Basis | Other Current Assets          
Derivatives, Fair Value          
Derivative asset, gross 41   41   7
Asset, netting [1] 0   0   0
Derivative asset, net 41   41   7
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 1          
Derivatives, Fair Value          
Derivative asset, gross 0   0   0
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 2          
Derivatives, Fair Value          
Derivative asset, gross 0   0   0
Fair Value Measured on a Recurring Basis | Other Current Assets | Level 3          
Derivatives, Fair Value          
Derivative asset, gross 41   41   7
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Electric Commodity          
Derivatives, Fair Value          
Derivative asset, gross 41   41   7
Asset, netting [1] 0   0   0
Derivative asset, net 41   41   7
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Level 1 | Electric Commodity          
Derivatives, Fair Value          
Derivative asset, gross 0   0   0
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Level 2 | Electric Commodity          
Derivatives, Fair Value          
Derivative asset, gross 0   0   0
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Level 3 | Electric Commodity          
Derivatives, Fair Value          
Derivative asset, gross 41   41   7
Fair Value, Measurements, Nonrecurring | Other Current Assets | PPAs          
Derivatives, Fair Value          
Derivative asset, net [2] 3   3   3
Fair Value, Measurements, Nonrecurring | Other Noncurrent Assets | PPAs          
Derivatives, Fair Value          
Derivative asset, net [2] 8   8   9
Fair Value, Measurements, Nonrecurring | Other Current Liabilities | PPAs          
Derivatives, Fair Value          
Derivative liability, net [2] 4   4   4
Fair Value, Measurements, Nonrecurring | Other Noncurrent Liabilities | PPAs          
Derivatives, Fair Value          
Derivative liability, net [2] $ 7   $ 7   $ 9
[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 June 30, 2021 and Dec. 31, 2020. At June 30, 2021 and Dec. 31, 2020, derivative assets and liabilities include no obligations to return cash collateral or rights to reclaim cash collateral. 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.