v3.26.1
Derivatives (Classification of Gross Fair Values of Derivative Instruments, Excluding Cash Collateral) (Detail) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Commodity derivatives | Other current assets    
Derivative [Line Items]    
Asset $ 3,112 $ 243
Liability 3,582 236
Commodity derivatives | Other Noncurrent Assets    
Derivative [Line Items]    
Asset 28 0
Liability 56 0
Embedded derivatives in commodity contracts | Other current liabilities    
Derivative [Line Items]    
Asset [1] 0 0
Liability [1] 18 6
Embedded derivatives in commodity contracts | Deferred credits and other liabilities    
Derivative [Line Items]    
Asset [1] 0 0
Liability [1] $ 43 $ 35
[1] Includes embedded derivatives.