v3.26.1
Risk Management and Hedging Activities - PAC - Balance Sheet Location (Details) - PAC - Commodity derivatives - USD ($)
$ in Millions
Jun. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Derivatives, Fair Value [Line Items]            
Cash collateral receivable $ 49   $ 71      
Total derivatives - net basis (53)   (66)      
Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent            
Derivatives, Fair Value [Line Items]            
Cash collateral receivable 0   0      
Total derivatives - net basis 2   5      
Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent            
Derivatives, Fair Value [Line Items]            
Cash collateral receivable 0   0      
Total derivatives - net basis 0   0      
Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesCurrent            
Derivatives, Fair Value [Line Items]            
Cash collateral receivable 49   67      
Total derivatives - net basis (37)   (48)      
Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent            
Derivatives, Fair Value [Line Items]            
Cash collateral receivable 0   4      
Total derivatives - net basis (18)   (23)      
Not Designated as Hedging            
Derivatives, Fair Value [Line Items]            
Derivative asset, gross 5   10      
Commodity derivatives (107)   (147)      
Total derivative asset (liability) (102)   (137)      
Net regulatory asset (liability) on derivative contracts 102 $ 111 137 $ 53 $ 81 $ 97
Not Designated as Hedging | Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent            
Derivatives, Fair Value [Line Items]            
Derivative asset, gross 2   5      
Commodity derivatives 0   0      
Total derivative asset (liability) 2   5      
Not Designated as Hedging | Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent            
Derivatives, Fair Value [Line Items]            
Derivative asset, gross 0   0      
Commodity derivatives 0   0      
Total derivative asset (liability) 0   0      
Not Designated as Hedging | Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesCurrent            
Derivatives, Fair Value [Line Items]            
Derivative asset, gross 3   4      
Commodity derivatives (89)   (119)      
Total derivative asset (liability) (86)   (115)      
Not Designated as Hedging | Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent            
Derivatives, Fair Value [Line Items]            
Derivative asset, gross 0   1      
Commodity derivatives (18)   (28)      
Total derivative asset (liability) $ (18)   $ (27)