FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Millions	Sep. 30, 2015	Mar. 13, 2015	Dec. 31, 2014
Unsecured debt | 4.65% Senior Notes due 2021
Financial Instruments
Stated interest rate (as a percent)	4.65%		4.65%
Unsecured debt | 4.375% Senior Notes due 2025
Financial Instruments
Stated interest rate (as a percent)	4.375%	4.375%
Unsecured debt | 5.09% Senior Notes due 2015
Financial Instruments
Stated interest rate (as a percent)			5.09%
Unsecured debt | 5.29% Senior Notes due 2020
Financial Instruments
Stated interest rate (as a percent)	5.29%		5.29%
Unsecured debt | 5.69% Senior Notes due 2035
Financial Instruments
Stated interest rate (as a percent)	5.69%		5.69%
Secured debt | 3.82% Series D Senior Notes due 2017
Financial Instruments
Stated interest rate (as a percent)	3.82%		3.82%
Carrying Value
Financial Instruments
Debt	$ 1,904		$ 1,695
Carrying Value | Term loan | Short-Term Loan Facility due 2015
Financial Instruments
Debt			170
Carrying Value | Revolving credit facility | Senior Credit Facility due 2017
Financial Instruments
Debt	190		330
Carrying Value | Term loan | 2013 Term Loan Facility due 2018
Financial Instruments
Debt	500		500
Carrying Value | Term loan | 2015 Term Loan Facility due 2018
Financial Instruments
Debt	170
Carrying Value | Unsecured debt | 4.65% Senior Notes due 2021
Financial Instruments
Debt	350		350
Carrying Value | Unsecured debt | 4.375% Senior Notes due 2025
Financial Instruments
Debt	349
Carrying Value | Unsecured debt | 5.09% Senior Notes due 2015
Financial Instruments
Debt			75
Carrying Value | Unsecured debt | Term Loan Facility due 2019
Financial Instruments
Debt	75
Carrying Value | Unsecured debt | 5.29% Senior Notes due 2020
Financial Instruments
Debt	100		100
Carrying Value | Unsecured debt | 5.69% Senior Notes due 2035
Financial Instruments
Debt	150		150
Carrying Value | Secured debt | 3.82% Series D Senior Notes due 2017
Financial Instruments
Debt	20		20
Fair Value | Level 2
Financial Instruments
Debt	1,900		1,751
Fair Value | Level 2 | Term loan | Short-Term Loan Facility due 2015
Financial Instruments
Debt			170
Fair Value | Level 2 | Revolving credit facility | Senior Credit Facility due 2017
Financial Instruments
Debt	190		330
Fair Value | Level 2 | Term loan | 2013 Term Loan Facility due 2018
Financial Instruments
Debt	500		500
Fair Value | Level 2 | Term loan | 2015 Term Loan Facility due 2018
Financial Instruments
Debt	170
Fair Value | Level 2 | Unsecured debt | 4.65% Senior Notes due 2021
Financial Instruments
Debt	347		375
Fair Value | Level 2 | Unsecured debt | 4.375% Senior Notes due 2025
Financial Instruments
Debt	330
Fair Value | Level 2 | Unsecured debt | 5.09% Senior Notes due 2015
Financial Instruments
Debt			76
Fair Value | Level 2 | Unsecured debt | Term Loan Facility due 2019
Financial Instruments
Debt	75
Fair Value | Level 2 | Unsecured debt | 5.29% Senior Notes due 2020
Financial Instruments
Debt	109		111
Fair Value | Level 2 | Unsecured debt | 5.69% Senior Notes due 2035
Financial Instruments
Debt	158		168
Fair Value | Level 2 | Secured debt | 3.82% Series D Senior Notes due 2017
Financial Instruments
Debt	$ 21		$ 21