v3.26.3
Fair Value Measurement - Schedule of Fair Value Hierarchy for Gross Financial Assets and Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in debt securities $ 1,597 $ 1,601
Commodity derivatives 1,503 604
Total assets 3,100 2,205
Commodity derivatives 1,371 538
Total liabilities 1,371 538
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in debt securities 266 270
Commodity derivatives 1,001 306
Total assets 1,267 576
Commodity derivatives 979 354
Total liabilities 979 354
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in debt securities 1,331 1,331
Commodity derivatives 465 230
Total assets 1,796 1,561
Commodity derivatives 288 124
Total liabilities 288 124
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in debt securities 0 0
Commodity derivatives 37 68
Total assets 37 68
Commodity derivatives 104 60
Total liabilities $ 104 $ 60