EARNINGS PER SHARE (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share Details [Abstract]
Net income attributable to TWC common shareholders	$ 529	$ 806	$ 1,406	$ 1,634
Net income allocated to participating securities	3	2	8	8
Net income attributable to TWC shareholders	$ 532	$ 808	$ 1,414	$ 1,642
Average common shares outstanding - basic (in shares)	285.0	305.7	289.9	310.2
Dilutive effect of nonparticipating equity awards (in shares)	1.9	2.0	1.7	2.0
Dilutive effect of participating equity awards (in shares)	2.1	2.5	2.2	2.6
Average common shares outstanding - diluted (in shares)	289.0	310.2	293.8	314.8
Net income per common share attributable to TWC common shareholders - basic (in US dollars per share)	$ 1.86	$ 2.64	$ 4.85	$ 5.27
Net income per common share attributable to TWC common shareholders - diluted (in US dollars per share)	$ 1.84	$ 2.60	$ 4.81	$ 5.22
Antidilutive securities excluded from earnings per share computation (in shares)				2.6