Operating Costs and Expenses (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Other Income and Expenses [Abstract]
Programming	$ 666	$ 606
Franchise, regulatory and connectivity	107	107
Cost to service customers	420	400
Marketing	136	133
Transition costs	21	0
Other	231	201
Operating costs and expenses (exclusive of items shown separately below)	$ 1,581	$ 1,447