Supplemental Cash Flow Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Cash (paid) received
Uncertain tax position	$ 1,317	$ 1,456		$ 1,780		$ 1,687
Interest, net of amounts capitalized	906	856		2,019	[1]
Income taxes, net of refunds	64	(882)	[2]	26
Non-cash investing activities
Fair value of properties and equipment acquired	640	3		178
Asset retirement cost additions	66	298		273
Accruals of property, plant, and equipment	824	549		754
Net liabilities assumed (divested) in acquisitions and divestitures	(158)	723		(114)
Property insurance receivable	0	0		49
Acquisition receivable	0	(32)		0
Non-cash investing and financing activities
Acquisition contingent consideration	0	103		0
Capital lease obligation	(2)	10	[3]	0
FPSO construction period obligation	0	11	[3]	59
Deferred drilling lease liability	14	30		0
Net Operating Loss Carryback [Member]
Cash (paid) received
Income taxes, net of refunds		881
Accounts Receivable Other [Member]
Cash (paid) received
Taxes related to the Tronox settlement	53	180
Tronox Litigation [Member] | Judicial Ruling [Member]
Cash (paid) received
Uncertain tax position	$ 1,200	$ 1,300
Interest, net of amounts capitalized				1,200
Tronox Litigation [Member] | Judicial Ruling [Member] | Accounts Receivable Other [Member]
Cash (paid) received
Taxes related to the Tronox settlement				881
Tronox Litigation [Member] | Judicial Ruling [Member] | Other Liabilities [Member]
Cash (paid) received
Uncertain tax position				$ 881

[1] Includes $1.2 billion of interest related to the Tronox settlement payment in 2015.

[2] Includes $881 million from a tax refund in 2016 related to the income tax benefit associated with the Company’s 2015 tax net operating loss carryback.

[3] Upon completion of the FPSO in the third quarter of 2016, the Company reported the construction period obligation as a capital lease obligation based on the fair value of the FPSO. See Note 12—Debt and Interest Expense.