FAIR VALUE MEASUREMENTS (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
4.65% Senior Notes due 2021
Financial Instruments
Stated interest rate (as a percent)	4.65%	4.65%
6.89% Series C Senior Notes due 2012
Financial Instruments
Stated interest rate (as a percent)	6.89%	6.89%
3.82% Series D Senior Notes due 2017
Financial Instruments
Stated interest rate (as a percent)	3.82%	3.82%
Fair Value
Financial Instruments
Long-term debt	714	763
Fair Value | Senior Credit Facility due 2017
Financial Instruments
Long-term debt	312	363
Fair Value | 4.65% Senior Notes due 2021
Financial Instruments
Long-term debt	372	368
Fair Value | 6.89% Series C Senior Notes due 2012
Financial Instruments
Long-term debt		3
Fair Value | 3.82% Series D Senior Notes due 2017
Financial Instruments
Long-term debt	30	29
Carrying Value
Financial Instruments
Long-term debt	688	742
Carrying Value | Senior Credit Facility due 2017
Financial Instruments
Long-term debt	312	363
Carrying Value | 4.65% Senior Notes due 2021
Financial Instruments
Long-term debt	349	349
Carrying Value | 6.89% Series C Senior Notes due 2012
Financial Instruments
Long-term debt		3
Carrying Value | 3.82% Series D Senior Notes due 2017
Financial Instruments
Long-term debt	27	27