Supplemental Cash Flow Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015		Jun. 30, 2014
Loss Contingencies [Line Items]
Interest, net of amounts capitalized (1)	$ 1,621	[1]	$ 342
Income taxes, net of refunds	6		655
Non-cash investing activities
Fair value of properties and equipment from non-cash transactions	126		5
Asset retirement cost additions	90		122
Accruals of property, plant, and equipment	901		1,344
Net liabilities assumed (divested) in acquisitions and divestitures	(29)		(32)
Non-cash investing and financing activities
Floating production, storage, and offloading vessel construction period obligation	43		$ 53
Tronox Litigation [Member] | Judicial Ruling [Member]
Loss Contingencies [Line Items]
Interest, net of amounts capitalized (1)	$ 1,200

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