FAIR VALUE MEASUREMENTS (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
4.65% Senior Notes due 2021
Financial Instruments
Stated interest rate (as a percent)	4.65%	4.65%
5.09% Unsecured Senior Notes due 2015
Financial Instruments
Stated interest rate (as a percent)	5.09%	5.09%
5.29% Unsecured Senior Notes due 2020
Financial Instruments
Stated interest rate (as a percent)	5.29%	5.29%
5.69% Unsecured Senior Notes due 2035
Financial Instruments
Stated interest rate (as a percent)	5.69%	5.69%
3.82% Series D Senior Notes due 2017
Financial Instruments
Stated interest rate (as a percent)	3.82%	3.82%
Carrying Value
Financial Instruments
Long-term debt	$ 1,568	$ 1,578
Carrying Value | Senior Credit Facility due 2017
Financial Instruments
Long-term debt	370	380
Carrying Value | Term Loan Facility due 2018
Financial Instruments
Long-term debt	500	500
Carrying Value | 4.65% Senior Notes due 2021
Financial Instruments
Long-term debt	349	349
Carrying Value | 5.09% Unsecured Senior Notes due 2015
Financial Instruments
Long-term debt	75	75
Carrying Value | 5.29% Unsecured Senior Notes due 2020
Financial Instruments
Long-term debt	100	100
Carrying Value | 5.69% Unsecured Senior Notes due 2035
Financial Instruments
Long-term debt	150	150
Carrying Value | 3.82% Series D Senior Notes due 2017
Financial Instruments
Long-term debt	24	24
Fair Value | Level 2
Financial Instruments
Long-term debt	1,617	1,597
Fair Value | Level 2 | Senior Credit Facility due 2017
Financial Instruments
Long-term debt	370	380
Fair Value | Level 2 | Term Loan Facility due 2018
Financial Instruments
Long-term debt	500	500
Fair Value | Level 2 | 4.65% Senior Notes due 2021
Financial Instruments
Long-term debt	361	353
Fair Value | Level 2 | 5.09% Unsecured Senior Notes due 2015
Financial Instruments
Long-term debt	79	79
Fair Value | Level 2 | 5.29% Unsecured Senior Notes due 2020
Financial Instruments
Long-term debt	115	106
Fair Value | Level 2 | 5.69% Unsecured Senior Notes due 2035
Financial Instruments
Long-term debt	167	154
Fair Value | Level 2 | 3.82% Series D Senior Notes due 2017
Financial Instruments
Long-term debt	$ 25	$ 25