- Definition

Net quantities of an enterprise's interests in proved developed reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves.

+ References+ Details

Supplemental Oil and Gas Disclosures - Proved Reserve Data (Parenthetical) (Detail)	Dec. 31, 2014 MBbls	Dec. 31, 2013 MBbls	Dec. 31, 2012 MBbls	Dec. 31, 2011 MBbls
Reserve Quantities [Line Items]
Proved developed reserves	1,651,291us-gaap_ProvedDevelopedReservesVolume	1,832,936us-gaap_ProvedDevelopedReservesVolume	1,981,945us-gaap_ProvedDevelopedReservesVolume	1,992,327us-gaap_ProvedDevelopedReservesVolume
Egypt [Member]
Reserve Quantities [Line Items]
Proved developed reserves	236,256	222,880	221,819	222,651
Egypt [Member] \| Noncontrolling Interest [Member]
Reserve Quantities [Line Items]
Proved developed reserves	93	90
Crude Oil and Condensate [Member]
Reserve Quantities [Line Items]
Proved developed reserves	784,770	794,795	825,811	804,653
Crude Oil and Condensate [Member] \| Egypt [Member]
Reserve Quantities [Line Items]
Proved developed reserves	128,712	119,242	106,746	105,840
Crude Oil and Condensate [Member] \| Egypt [Member] \| Noncontrolling Interest [Member]
Reserve Quantities [Line Items]
Proved developed reserves	48,000	45,000
Natural Gas Liquids [Member]
Reserve Quantities [Line Items]
Proved developed reserves	204,628	217,129	183,949	145,438
Natural Gas Liquids [Member] \| Egypt [Member]
Reserve Quantities [Line Items]
Proved developed reserves	1,346
Natural Gas Liquids [Member] \| Egypt [Member] \| Noncontrolling Interest [Member]
Reserve Quantities [Line Items]
Proved developed reserves	519
Natural Gas [Member]
Reserve Quantities [Line Items]
Proved developed reserves	3,971,360	4,926,064	5,833,105	6,253,418
Natural Gas [Member] \| Egypt [Member]
Reserve Quantities [Line Items]
Proved developed reserves	637,187	621,825	690,436	700,866
Natural Gas [Member] \| Egypt [Member] \| Noncontrolling Interest [Member]
Reserve Quantities [Line Items]
Proved developed reserves	270	271