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Fair Value of Financial Assets and Liabilities - Recurring Fair Value Measurements (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 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 41 $ 16 7 $ 12  
Purchases 2 0 11 21  
Settlements (18) (1) (39) (18)  
Net gains recognized as regulatory assets and liabilities 12 (4) 58 (4)  
Balance at end of period 37 11 37 11  
Transfers Level 3, Net 0 $ 0 0 $ 0  
Other Current Assets          
Derivatives, Fair Value          
Derivative asset, net 40   40   10
Other Noncurrent Assets          
Derivatives, Fair Value          
Derivative asset, net 7   7   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 37   37   7
Asset, netting [1] 0   0   0
Derivative asset, net 37   37   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 37   37   7
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Electric Commodity          
Derivatives, Fair Value          
Derivative asset, gross 37   37   7
Asset, netting [1] 0   0   0
Derivative asset, net 37   37   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 37   37   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] 7   7   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 Sept. 30, 2021 and Dec. 31, 2020. At Sept. 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.