FAIR VALUE MEASUREMENTS (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
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	$ 1,551	$ 1,013
Carrying Value | Senior Credit Facility due 2017
Financial Instruments
Long-term debt	350	312
Carrying Value | Term Loan Facility due 2018
Financial Instruments
Long-term debt	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	27	27
Fair Value | Level 2
Financial Instruments
Long-term debt	1,598	1,121
Fair Value | Level 2 | Senior Credit Facility due 2017
Financial Instruments
Long-term debt	350	312
Fair Value | Level 2 | Term Loan Facility due 2018
Financial Instruments
Long-term debt	500
Fair Value | Level 2 | 4.65% Senior Notes due 2021
Financial Instruments
Long-term debt	353	372
Fair Value | Level 2 | 5.09% Unsecured Senior Notes due 2015
Financial Instruments
Long-term debt	80	83
Fair Value | Level 2 | 5.29% Unsecured Senior Notes due 2020
Financial Instruments
Long-term debt	114	123
Fair Value | Level 2 | 5.69% Unsecured Senior Notes due 2035
Financial Instruments
Long-term debt	172	201
Fair Value | Level 2 | 3.82% Series D Senior Notes due 2017
Financial Instruments
Long-term debt	$ 29	$ 30