Supplemental Oil and Gas Disclosures - Principal Sources of Change In Discounted Future Net Cash Flows (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended
Apr. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Extractive Industries [Abstract]
Sales, net of production costs	$ (374)	$ (10,350)	$ (12,271)	$ (12,589)
Net change in prices and production costs		(1,029)	1,438	(1,941)
Discoveries and improved recovery, net of related costs		6,297	6,892	6,742
Change in future development costs		1,136	(2,017)	(935)
Previously estimated development costs incurred during the period		4,462	4,654	4,359
Revision of quantities		256	500	(4,065)
Purchases of minerals in-place		508	227	1,181
Accretion of discount		4,442us-gaap_AccretionOfDiscount	4,823us-gaap_AccretionOfDiscount	5,234us-gaap_AccretionOfDiscount
Change in income taxes		836	855	2,711
Sales of properties		(4,780)	(6,232)	(3)
Change in production rates and other		(442)	(828)	(2,088)
Change in the discounted future net cash flows, Total		$ (936)	$ (1,959)	$ (1,394)

Net increase decrease in production rates and other.

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Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of passage of time.

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