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Derivatives - Classification of Gross Fair Values of Derivative Instruments, Excluding Cash Collateral (Detail) - Commodity derivatives - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Other current assets    
Derivatives, Fair Value [Line Items]    
Asset $ 184 $ 400
Liability 176 283
Other current liabilities(a)    
Derivatives, Fair Value [Line Items]    
Asset 1 1
Liability [1] 6 16
Deferred credits and other liabilities    
Derivatives, Fair Value [Line Items]    
Asset 0 0
Liability [1] $ 49 $ 54
[1]
Includes embedded derivatives.