EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended		9 Months Ended
	Dec. 31, 2014	Nov. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Basic EPS calculation
Net income / (loss)			$ (104)	$ 188	$ (272)	$ 657
Net income / (loss) allocated to participating securities				(3)		(11)
Net income / (loss) available to common stockholders			$ (104)	$ 185	$ (272)	$ 646
Weighed average common shares outstanding - basic			383.1	381.8	382.7	381.8
Basic EPS (in dollars per share)			$ (0.27)	$ 0.48	$ (0.71)	$ 1.69
Diluted EPS calculation
Net income / (loss)			$ (104)	$ 188	$ (272)	$ 657
Net income / (loss) allocated to participating securities				(3)		(11)
Net income / (loss) available to common stockholders			$ (104)	$ 185	$ (272)	$ 646
Weighed average common shares outstanding - basic			383.1	381.8	382.7	381.8
Dilutive effect of potentially dilutive securities
Weighted average common shares outstanding - diluted			383.1	381.8	382.7	381.8
Diluted EPS (in dollars per share)			$ (0.27)	$ 0.48	$ (0.71)	$ 1.69
Employee Stock Purchase Plan
Diluted EPS calculation
Common stock issued under employee stock purchase plan			792,000		1,500,000
Occidental Petroleum And Subsidiaries | Spinoff - CRC
Diluted EPS calculation
Common stock issued upon Spin-off		381,400,000
Weighted average basic share count for periods presented prior to Spin-off	381,800,000