ENVIRONMENTAL LIABILITIES AND EXPENDITURES (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 site	Dec. 31, 2012 site	Dec. 31, 2011 site	Dec. 31, 2010
ENVIRONMENTAL LIABILITIES AND EXPENDITURES
Environmental remediation reserves, current, included in accrued liabilities	$ 78	$ 80	$ 79
Environmental remediation reserves, noncurrent, included in deferred credits and other liabilities - other	252	264	281
Environmental remediation reserves
Number of Sites	157	161	160
Reserve Balance	330	344	360	366
Environmental reserves, exceeding $ ten million, threshold value	10
Environmental reserves, exceeding $ ten million, number of sites	10
Environmental reserves, range between zero to $ one million site category, number of sites	108
Minimum period of expending second half of environmental reserves	10 years
Environmental remediation additional loss range	380
Environmental costs, including certain estimates by segment
Operating Expenses	229	250	247
Capital Expenditures	118	152	140
Low end of range
Environmental remediation reserves
Environmental reserves, range between zero to $ one million site category	0
Period of expending first half of environmental reserves	3 years
High end of range
Environmental remediation reserves
Environmental reserves, range between zero to $ one million site category	1
Period of expending first half of environmental reserves	4 years
Oil and Gas
Environmental costs, including certain estimates by segment
Operating Expenses	137	160	158
Capital Expenditures	97	122	110
Chemical
Environmental costs, including certain estimates by segment
Operating Expenses	75	70	68
Capital Expenditures	14	18	15
Midstream, Marketing and Other
Environmental costs, including certain estimates by segment
Operating Expenses	17	20	21
Capital Expenditures	7	12	15
Corporate
Environmental costs, including certain estimates by segment
Remediation Expenses	60	56	52
NPL sites
Environmental remediation reserves
Number of Sites	31	35	36
Reserve Balance	25	54	63
Number of sites with significant environmental remediation reserves	2
Percentage of environmental reserves accounted for by associated sites	60.00%
Number of sites indemnified by third party	14
Third-party sites
Environmental remediation reserves
Number of Sites	74	75	73
Reserve Balance	83	84	88
Number of sites with significant environmental remediation reserves	3
Percentage of environmental reserves accounted for by associated sites	52.00%
Number of sites indemnified by third party	8
Number of sites not indemnified by third party	66
Occidental-operated sites
Environmental remediation reserves
Number of Sites	20	22	22
Reserve Balance	118	123	120
Number of sites with significant environmental remediation reserves	4
Percentage of environmental reserves accounted for by associated sites	61.00%
Closed or non-operated Occidental sites
Environmental remediation reserves
Number of Sites	32	29	29
Reserve Balance	$ 104	$ 83	$ 89
Number of sites with significant environmental remediation reserves	4
Percentage of environmental reserves accounted for by associated sites	64.00%