Supplemental Cash Flow Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015		Sep. 30, 2014
Cash (paid) received
Interest, net of amounts capitalized (1)	$ 1,916	[1]	$ 600
Income taxes, net of refunds	(163)		661
Non-cash investing activities
Fair value of properties and equipment from non-cash transactions	156		7
Asset retirement cost additions	139		149
Accruals of property, plant, and equipment	858		1,154
Net liabilities assumed (divested) in acquisitions and divestitures	(84)		(126)
Non-cash investing and financing activities
Floating production, storage, and offloading vessel construction period obligation	51		$ 88
Tronox Litigation [Member] | Judicial Ruling [Member]
Cash (paid) received
Taxes related to the Tronox settlement	577
Interest, net of amounts capitalized (1)	1,200
Tronox Litigation [Member] | Judicial Ruling [Member] | Accounts Receivable Other [Member]
Cash (paid) received
Taxes related to the Tronox settlement	887
Tronox Litigation [Member] | Judicial Ruling [Member] | Other Liabilities [Member]
Cash (paid) received
Unrecognized tax benefits	$ 887

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