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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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DEBT (Details) $ in Millions				6 Months Ended	12 Months Ended
DEBT (Details) $ in Millions	Feb. 25, 2015 USD ($)	Oct. 01, 2014 USD ($)	Sep. 24, 2014 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2015	Dec. 31, 2014 USD ($)
Debt
Debt				$ 6,590		$ 6,360
Less: Current maturities of long-term debt				(50)
Less: Deferred financing costs				(64)		(68)
Total long-term debt, net				6,476		6,292
Maximum borrowing capacity			$ 2,000
Senior Notes
Debt
Aggregate principal amount		$ 5,000
Net Proceeds from private placement		4,950
Cash distribution to Occidental in October 2014		$ 4,950
Semi annual interest payment		semi-annually
Percentage of principal amount at which senior notes can be redeemed		101.00%
5.00% Senior notes due 2020
Debt
Debt		$ 1,000		$ 1,000		$ 1,000
Debt Instrument, Interest Rate, Stated Percentage		5.00%		5.00%		5.00%
5.50% Senior notes due 2021
Debt
Debt		$ 1,750		$ 1,750		$ 1,750
Debt Instrument, Interest Rate, Stated Percentage		5.50%		5.50%		5.50%
6.00% Senior notes due 2024
Debt
Debt		$ 2,250		$ 2,250		$ 2,250
Debt Instrument, Interest Rate, Stated Percentage		6.00%		6.00%		6.00%
Credit Facilities
Debt
Credit agreement leverage ratio			4.50
Credit Facilities \| LIBOR
Debt
Variable rate basis			LIBOR
Credit Facilities \| Alternate Base Rate
Debt
Variable rate basis			alternate base rate
Variable rate basis			one-month LIBOR
Interest rate added to variable rate basis(as a percent)			1.00%
Credit Facilities \| Prime Rate
Debt
Variable rate basis			agent's prime rate
Credit Facilities \| Federal fund rate
Debt
Variable rate basis			federal funds effective rate
Interest rate added to variable rate basis(as a percent)			0.50%
Credit Facilities \| Thereafter
Debt
Credit agreement leverage ratio during interim covenant period			4.50
Credit Facilities \| Minimum
Debt
Credit agreement interest expense ratio			2.50		2.25
Credit Facilities \| Minimum \| LIBOR
Debt
Interest rate added to variable rate basis(as a percent)			1.50%
Credit Facilities \| Minimum \| Alternate Base Rate
Debt
Interest rate added to variable rate basis(as a percent)			0.50%
Credit Facilities \| Maximum \| LIBOR
Debt
Interest rate added to variable rate basis(as a percent)			2.25%
Credit Facilities \| Maximum \| Alternate Base Rate
Debt
Interest rate added to variable rate basis(as a percent)			1.25%
Credit Facilities amendment - Interim Covenant Period
Debt
Maximum borrowing capacity	$ 1,250
Credit Facilities amendment - Interim Covenant Period \| June 30, 2015
Debt
Credit agreement leverage ratio during interim covenant period	4.75
Credit Facilities amendment - Interim Covenant Period \| September 30, 2015
Debt
Credit agreement leverage ratio during interim covenant period	6.25
Credit Facilities amendment - Interim Covenant Period \| December 31, 2015
Debt
Credit agreement leverage ratio during interim covenant period	8.25
Credit Facilities amendment - Interim Covenant Period \| March 31, 2016
Debt
Credit agreement leverage ratio during interim covenant period	8.00
Credit Facilities amendment - Interim Covenant Period \| June 30, 2016
Debt
Credit agreement leverage ratio during interim covenant period	7.25
Credit Facilities amendment - Interim Covenant Period \| September 30, 2016
Debt
Credit agreement leverage ratio during interim covenant period	6.75
Credit Facilities amendment - Interim Covenant Period \| December 31, 2016
Debt
Credit agreement leverage ratio during interim covenant period	6.25
Credit Facilities amendment - Interim Covenant Period \| Minimum
Debt
Credit agreement asset coverage ratio during interim covenant period	1.05
Cash On Hand In Excess Of This Amount During The Interim Covenant Period Must Be Used To Pay Off Outstanding Debt Under the Revolving Credit Facility	$ 250
Term loan facility
Debt
Debt				$ 1,000		$ 1,000
Senior term loan facility and senior revolving credit facility			5 years
Maximum borrowing capacity			$ 1,000
Quarterly installment payment beginning March 31, 2016				25
Revolving credit facility
Debt
Debt				590		$ 360
Senior term loan facility and senior revolving credit facility			5 years
Maximum borrowing capacity			$ 1,000
Revolving credit facility \| Minimum
Debt
Commitment fees on unused portion of the Revolving Credit Facility			0.30%
Revolving credit facility \| Maximum
Debt
Amount available for additional borrowings				$ 697
Commitment fees on unused portion of the Revolving Credit Facility			0.50%
Letter of Credit
Debt
Maximum borrowing capacity			$ 400