Property, Plant and Equipment - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2018	Dec. 31, 2017
Property Plant And Equipment [Line Items]
Assets held for sale	$ 421	$ 0
Expense of exploratory wells costs incurred	13
Capitalized exploratory well costs that have been capitalized for period greater than one year	$ 239
Northern Portion of Shenzi Field, Gulf of Mexico
Property Plant And Equipment [Line Items]
Capitalized well costs percentage	50.00%
Project interest percentage	28.00%
Liza-4 and Payara-1 Wells on the Stabroek Block, Offshore Guyana
Property Plant And Equipment [Line Items]
Capitalized well costs percentage	30.00%
Project interest percentage	30.00%
JDA, Gulf of Thailand
Property Plant And Equipment [Line Items]
Capitalized well costs percentage	20.00%
Project interest percentage	50.00%
Utica Shale Play, Eastern Ohio
Property Plant And Equipment [Line Items]
Assets held for sale	$ 365
Utica Shale Play, Eastern Ohio \| Accrued Liabilities
Property Plant And Equipment [Line Items]
Liabilities held for sale	2
Non-Core Acreage, North Dakota
Property Plant And Equipment [Line Items]
Assets held for sale	$ 56

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Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.

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The amount of exploratory well costs that have been capitalized for a period of greater than one year after the completion of drilling.

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