CREDIT FACILITIES AND LONG-TERM DEBT (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Credit facilities and long-term debt
Total long-term debt	$ 1,568		$ 1,578
Less: current portion of long-term debt	3		3
Long-term debt	1,565		1,575
Senior Credit Facility due 2017
Credit facilities and long-term debt
Total long-term debt	370		380
Senior Credit Facility due 2017 | LIBOR
Credit facilities and long-term debt
Variable rate basis	LIBOR	LIBOR	LIBOR
Debt average interest rate (as a percent)	1.42%	1.46%
Debt interest rate, at period end, prior to hedging activities (as a percent)	1.41%		1.42%
Senior revolving credit facility
Credit facilities and long-term debt
Maximum borrowing capacity	500
Amount outstanding under credit facility	370		380
Remaining borrowing capacity	130
Term Loan Facility due 2018
Credit facilities and long-term debt
Total long-term debt	500		500
Term Loan Facility due 2018 | LIBOR borrowings | LIBOR
Credit facilities and long-term debt
Variable rate basis	LIBOR		LIBOR
Debt average interest rate (as a percent)	1.42%
Debt average interest rate, after hedging activity (as a percent)	1.83%
Debt interest rate, at period end, prior to hedging activities (as a percent)	1.41%		1.42%
4.65% Unsecured Senior Notes due 2021
Credit facilities and long-term debt
Stated interest rate (as a percent)	4.65%		4.65%
Total long-term debt	349		349
5.09% Unsecured Senior Notes due 2015
Credit facilities and long-term debt
Stated interest rate (as a percent)	5.09%		5.09%
Total long-term debt	75		75
5.29% Unsecured Senior Notes due 2020
Credit facilities and long-term debt
Stated interest rate (as a percent)	5.29%		5.29%
Total long-term debt	100		100
5.69% Unsecured Senior Notes due 2035
Credit facilities and long-term debt
Stated interest rate (as a percent)	5.69%		5.69%
Total long-term debt	150		150
3.82% Series D Senior Notes due 2017
Credit facilities and long-term debt
Stated interest rate (as a percent)	3.82%		3.82%
Total long-term debt	$ 24		$ 24
GTN | Senior Notes | Maximum
Credit facilities and long-term debt
Percentage of debt to total capitalization	70.00%