Supplemental Cash Flow Information (Detail) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016
Cash paid (received)
Interest, net of amounts capitalized		$ 764	$ 735
Income taxes, net of refunds (1)	[1]	169	(878)
Non-cash investing activities
Fair value of properties and equipment from non-cash transactions		619	2
Asset retirement cost additions		228	85
Accruals of property, plant, and equipment		786	454
Net liabilities assumed (divested) in acquisitions and divestitures		(115)	(39)
Non-cash investing and financing activities
Capital lease obligation	[2]	0	10
FPSO construction period obligation	[2]	0	11
Deferred drilling lease liability		$ 14	3
Net Operating Loss Carryback [Member]
Cash paid (received)
Income taxes, net of refunds (1)			$ 881

[1] 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.

[2] 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.