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Fair Value of Financial Assets and Liabilities - Recurring Fair Value Measurements (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Derivatives, Fair Value      
Return Cash Collateral $ 0   $ 0
Changes in Level 3 Commodity Derivatives      
Derivative instruments designated as fair value hedges 0 $ 0  
Derivative Asset, Noncurrent 14   0
Commodity Contract [Member]      
Changes in Level 3 Commodity Derivatives      
Balance at beginning of period 67 39  
Purchases [1] 66 3  
Settlements [1] (48) (36)  
Net gains recognized as regulatory assets and liabilities [1] 18 46  
Balance at end of period 103 $ 52  
Fair Value Measured on a Recurring Basis      
Derivatives, Fair Value      
Derivative asset, gross 89   67
Asset, netting [2] 0   0
Changes in Level 3 Commodity Derivatives      
Derivative Asset, Current 89   67
Derivative Asset, Noncurrent 14   0
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets      
Derivatives, Fair Value      
Derivative asset, gross 14   0
Asset, netting [2] 0   0
Fair Value Measured on a Recurring Basis | Level 1      
Derivatives, Fair Value      
Derivative asset, gross 0   0
Fair Value Measured on a Recurring Basis | Level 1 | Other Noncurrent Assets      
Derivatives, Fair Value      
Derivative asset, gross 0   0
Fair Value Measured on a Recurring Basis | Level 2      
Derivatives, Fair Value      
Derivative asset, gross 0   0
Fair Value Measured on a Recurring Basis | Level 2 | Other Noncurrent Assets      
Derivatives, Fair Value      
Derivative asset, gross 0   0
Fair Value Measured on a Recurring Basis | Level 3      
Derivatives, Fair Value      
Derivative asset, gross 89   67
Fair Value Measured on a Recurring Basis | Level 3 | Other Noncurrent Assets      
Derivatives, Fair Value      
Derivative asset, gross 14   0
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Electric Commodity      
Derivatives, Fair Value      
Derivative asset, gross 89   67
Asset, netting [2] 0   0
Changes in Level 3 Commodity Derivatives      
Derivative Asset, Current 89   67
Derivative Asset, Noncurrent 14   0
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Electric Commodity | Other Noncurrent Assets      
Derivatives, Fair Value      
Derivative asset, gross 14   0
Asset, netting [2] 0   0
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 1 | Electric Commodity      
Derivatives, Fair Value      
Derivative asset, gross 0   0
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 1 | Electric Commodity | Other Noncurrent Assets      
Derivatives, Fair Value      
Derivative asset, gross 0   0
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 2 | Electric Commodity      
Derivatives, Fair Value      
Derivative asset, gross 0   0
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 2 | Electric Commodity | Other Noncurrent Assets      
Derivatives, Fair Value      
Derivative asset, gross 0   0
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 3 | Electric Commodity      
Derivatives, Fair Value      
Derivative asset, gross 89   67
Fair Value Measured on a Recurring Basis | Other Derivative Instruments | Level 3 | Electric Commodity | Other Noncurrent Assets      
Derivatives, Fair Value      
Derivative asset, gross $ 14   $ 0
[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 March 31, 2025 and Dec. 31, 2024, derivative assets and liabilities include no obligations to return cash collateral or rights to reclaim cash collateral. Counterparty netting amounts presented exclude settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.