Supplemental Cash Flow Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash (paid) received
Uncertain tax position	$ 1,780		$ 1,687	$ 147	$ 46
Interest, net of amounts capitalized(1)	2,019	[1]	689	627
Income taxes, net of refunds	26		956	169
Non-cash investing activities
Fair value of properties and equipment from non-cash transactions	178		18	62
Asset retirement cost additions	273		348	297
Accruals of property, plant, and equipment	754		1,177	1,446
Net liabilities assumed (divested) in acquisitions and divestitures	(114)		(92)	(80)
Property insurance receivable	49		0	0
Non-cash investing and financing activities
Capital lease obligation	0		13	8
Floating production, storage, and offloading vessel construction period obligation	59		128	$ 17
Accounts Receivable Other [Member]
Cash (paid) received
Taxes related to the Tronox settlement	1,046		$ 93
Tronox Litigation [Member] | Judicial Ruling [Member]
Cash (paid) received
Interest, net of amounts capitalized(1)	1,200
Tronox Litigation [Member] | Accounts Receivable Other [Member] | Judicial Ruling [Member]
Cash (paid) received
Taxes related to the Tronox settlement	881
Tronox Litigation [Member] | Other Liabilities [Member] | Judicial Ruling [Member]
Cash (paid) received
Uncertain tax position	$ 881

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