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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Derivatives, Fair Value          
Return Cash Collateral $ 0   $ 0   $ 0
Changes in Level 3 Commodity Derivatives          
Derivative instruments designated as fair value hedges 0 $ 0 0 $ 0  
Derivative Asset, Current 113   113   42
Derivative Liability, Noncurrent 0   0   2
Commodity Contract [Member]          
Changes in Level 3 Commodity Derivatives          
Balance at beginning of period 146 83 39 119  
Purchases [1] 2 1 107 75  
Settlements [1] (64) (18) (183) (66)  
Net gains recognized as regulatory assets and liabilities [1] 28 (3) 149 (65)  
Balance at end of period 112 $ 63 112 $ 63  
Fair Value Measured on a Recurring Basis          
Derivatives, Fair Value          
Derivative asset, gross 112   112   39
Asset, netting [2] 0   0   0
Changes in Level 3 Commodity Derivatives          
Derivative Asset, Current 112   112   39
Fair Value Measured on a Recurring Basis | Level 1          
Derivatives, Fair Value          
Derivative asset, gross 0   0   0
Fair Value Measured on a Recurring Basis | Level 2          
Derivatives, Fair Value          
Derivative asset, gross 0   0   0
Fair Value Measured on a Recurring Basis | Level 3          
Derivatives, Fair Value          
Derivative asset, gross 112   112   39
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Electric Commodity          
Derivatives, Fair Value          
Derivative asset, gross 112   112   39
Asset, netting [2] 0   0   0
Changes in Level 3 Commodity Derivatives          
Derivative Asset, Current 112   112   39
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 1 | Electric Commodity          
Derivatives, Fair Value          
Derivative asset, gross 0   0   0
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 2 | Electric Commodity          
Derivatives, Fair Value          
Derivative asset, gross 0   0   0
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 3 | Electric Commodity          
Derivatives, Fair Value          
Derivative asset, gross 112   112   39
Fair Value, Measurements, Nonrecurring | PPAs          
Changes in Level 3 Commodity Derivatives          
Derivative Asset, Current [3] 1   1   3
Derivative Liability, Noncurrent [3] $ 0   $ 0   $ 2
[1] Relates primarily to FTR instruments administered by SPP.
[2] SPS nets derivative instruments and related collateral on its balance sheet when supported by a legally enforceable master netting agreement. At Sept. 30, 2024 and Dec. 31, 2023, derivative assets and liabilities include no obligations to return cash collateral or rights to reclaim cash collateral.
[3] SPS 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.