EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended		6 Months Ended
	Dec. 31, 2014	Nov. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Basic EPS calculation
Net income / (loss)			$ (68)	$ 246	$ (168)	$ 469
Net income / (loss) allocated to participating securities				(4)		(8)
Net income / (loss) available to common stockholders			$ (68)	$ 242	$ (168)	$ 461
Weighed average common shares outstanding - basic			382.7	381.8	382.4	381.8
Basic EPS (in dollars per share)			$ (0.18)	$ 0.63	$ (0.44)	$ 1.21
Diluted EPS calculation
Net income / (loss)			$ (68)	$ 246	$ (168)	$ 469
Net income / (loss) allocated to participating securities				(4)		(8)
Net income / (loss) available to common stockholders			$ (68)	$ 242	$ (168)	$ 461
Weighed average common shares outstanding - basic			382.7	381.8	382.4	381.8
Weighted average common shares outstanding - diluted			382.7	381.8	382.4	381.8
Diluted EPS (in dollars per share)			$ (0.18)	$ 0.63	$ (0.44)	$ 1.21
Employee Stock Purchase Plan
Diluted EPS calculation
Common stock issued under employee stock purchase plan			365,000		735,000
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