Supplemental Cash Flow Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash (paid) received
Interest, net of amounts capitalized (1)	$ 299	$ 1,532	[1]
Income taxes, net of refunds	(8)	(5)
Non-cash investing activities
Fair value of properties and equipment from non-cash transactions	0	54
Asset retirement cost additions	27	63
Accruals of property, plant, and equipment	623	1,080
Net liabilities assumed (divested) in acquisitions and divestitures	0	19
Non-cash investing and financing activities
Floating production, storage, and offloading vessel construction period obligation	$ 2	25
Tronox Litigation [Member] | Judicial Ruling [Member]
Cash (paid) received
Interest, net of amounts capitalized (1)		$ 1,200

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