CREDIT FACILITIES AND LONG-TERM DEBT (Details) (USD $) In Millions, unless otherwise specified					3 Months Ended		9 Months Ended						0 Months Ended		0 Months Ended	3 Months Ended			0 Months Ended				0 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Senior Credit Facility due 2017	Dec. 31, 2012 Senior Credit Facility due 2017	Sep. 30, 2013 Senior Credit Facility due 2017 LIBOR	Sep. 30, 2012 Senior Credit Facility due 2017 LIBOR	Sep. 30, 2013 Senior Credit Facility due 2017 LIBOR	Sep. 30, 2012 Senior Credit Facility due 2017 LIBOR	Dec. 31, 2012 Senior Credit Facility due 2017 LIBOR	Sep. 30, 2013 Senior revolving credit facility	Jul. 02, 2013 Senior revolving credit facility	Dec. 31, 2012 Senior revolving credit facility	Jul. 02, 2013 Term Loan Facility due 2018	Sep. 30, 2013 Term Loan Facility due 2018	Jul. 02, 2013 Term Loan LIBOR borrowings LIBOR	Sep. 30, 2013 Term Loan LIBOR borrowings LIBOR	Jul. 02, 2013 Term Loan LIBOR borrowings LIBOR Minimum	Jul. 02, 2013 Term Loan LIBOR borrowings LIBOR Maximum	Jul. 02, 2013 Term Loan base rate borrowings LIBOR	Jul. 02, 2013 Term Loan base rate borrowings Base rate	Jul. 02, 2013 Term Loan base rate borrowings Base rate Minimum	Jul. 02, 2013 Term Loan base rate borrowings Base rate Maximum	Jul. 02, 2013 Term Loan base rate borrowings Prime rate	Jul. 02, 2013 Term Loan base rate borrowings Federal funds rate	Sep. 30, 2013 4.65% Unsecured Senior Notes due 2021	Dec. 31, 2012 4.65% Unsecured Senior Notes due 2021	Sep. 30, 2013 5.09% Unsecured Senior Notes due 2015	Dec. 31, 2012 5.09% Unsecured Senior Notes due 2015	Sep. 30, 2013 5.29% Unsecured Senior Notes due 2020	Dec. 31, 2012 5.29% Unsecured Senior Notes due 2020	Sep. 30, 2013 5.69% Unsecured Senior Notes due 2035	Dec. 31, 2012 5.69% Unsecured Senior Notes due 2035	Sep. 30, 2013 3.82% Series D Senior Notes due 2017	Dec. 31, 2012 3.82% Series D Senior Notes due 2017
Credit facility and long-term debt
Stated interest rate (as a percent)																									4.65%	4.65%	5.09%	5.09%	5.29%	5.29%	5.69%	5.69%	3.82%	3.82%
Total long-term debt	$ 1,551	$ 1,013	$ 350	$ 312										$ 500											$ 349	$ 349	$ 75	$ 75	$ 100	$ 100	$ 150	$ 150	$ 27	$ 27
Less: current portion of long-term debt	3	3
Long-term debt	1,548	1,010
Maximum borrowing capacity										500	500		500
Borrowings under the facility													500
Term of the facility													5 years
Amount outstanding under credit facility										350		312
Remaining borrowing capacity										$ 150
Variable rate basis					LIBOR	LIBOR	LIBOR	LIBOR							LIBOR	LIBOR			one-month LIBOR	Lender prime rate, federal funds rate or one-month LIBOR			Prime rate	Federal funds rate
Debt average interest rate (as a percent)					1.44%	1.62%	1.45%	1.63%								1.44%
Debt average interest rate, after hedging activity (as a percent)																1.56%
Basis spread on variable rate (as a percent)																	1.125%	2.00%	1.00%		0.125%	1.00%		0.50%
Debt interest rate at end of period (as a percent)					1.44%		1.44%		1.47%							1.44%