| Describes the reasons an enterprise did not disclose reserve estimates or amounts in figures for the named country or that reserve estimates include reserves other than proved due to a government 1) restricting the disclosure of estimated reserves for property under its authority; 2) restricting disclosure of amounts under long-term supply, purchase, or similar agreement or contracts; or 3) requiring the disclosure of reserves other than proved. | en-US | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |