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Derivatives (Classification of Gross Fair Values of Derivative Instruments, Excluding Cash Collateral) (Detail) - Commodity derivatives - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Other current assets    
Derivative [Line Items]    
Asset $ 761 $ 271
Liability 622 249
Other current liabilities    
Derivative [Line Items]    
Asset 0 0
Liability [1] 14 15
Deferred credits and other liabilities    
Derivative [Line Items]    
Asset 0 0
Liability [1] $ 78 $ 93
[1] Includes embedded derivatives.