DERIVATIVES (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
After-tax Derivative Activity recorded in AOCI
Unrealized (losses) gains recognized in AOCI	$ 5	$ (5)
Reclassification to income of realized losses (gains) on derivatives		$ 8

Other comprehensive income unrealized gain loss on derivatives arising during period including only the derivative portion of the hedge, net of tax.

No definition available.

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Namespace Prefix:	oxy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration