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Derivatives (Classification of Gross Fair Values of Derivative Instruments, Excluding Cash Collateral) (Detail) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Commodity derivatives | Other current assets    
Derivative [Line Items]    
Asset $ 303 $ 244
Liability 295 249
Embedded derivatives in commodity contracts | Other current liabilities    
Derivative [Line Items]    
Asset 0 0
Liability 10 11
Embedded derivatives in commodity contracts | Deferred credits and other liabilities    
Derivative [Line Items]    
Asset 0 0
Liability $ 59 $ 50