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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 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 148   148   42
Derivative Liability, Noncurrent 0   0   2
Commodity Contract [Member]          
Changes in Level 3 Commodity Derivatives          
Balance at beginning of period 52 23 39 119  
Purchases [1] 102 68 105 74  
Settlements [1] (83) (32) (119) (48)  
Net gains recognized as regulatory assets and liabilities [1] 75 24 121 (62)  
Balance at end of period 146 $ 83 146 $ 83  
Fair Value Measured on a Recurring Basis          
Derivatives, Fair Value          
Derivative asset, gross 146   146   39
Asset, netting [2] 0   0   0
Changes in Level 3 Commodity Derivatives          
Derivative Asset, Current 146   146   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 146   146   39
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Electric Commodity          
Derivatives, Fair Value          
Derivative asset, gross 146   146   39
Asset, netting [2] 0   0   0
Changes in Level 3 Commodity Derivatives          
Derivative Asset, Current 146   146   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 146   146   39
Fair Value, Measurements, Nonrecurring | PPAs          
Changes in Level 3 Commodity Derivatives          
Derivative Asset, Current [3] 2   2   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 June 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.