v3.26.1
Risk Management - Derivative Assets Input Level (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount $ 124 $ 248
Energy commodity derivative contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount 75 171
Contracts available for netting (66) (68)
Cash collateral held 0 0
Net amount 9 103
Energy commodity derivative contracts | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount 35 20
Energy commodity derivative contracts | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount 40 151
Energy commodity derivative contracts | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount 0 0
Interest rate contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount 24 36
Contracts available for netting (5) (6)
Cash collateral held 0 0
Net amount 19 30
Interest rate contracts | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount 0 0
Interest rate contracts | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount 24 36
Interest rate contracts | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount 0 0
Foreign currency contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount 25 41
Contracts available for netting 0 0
Cash collateral held 0 0
Net amount 25 41
Foreign currency contracts | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount 0 0
Foreign currency contracts | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount 25 41
Foreign currency contracts | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gross amount $ 0 $ 0