Operating Costs and Expenses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Operating Costs and Expenses [Abstract]
Programming	$ 2,790	$ 2,778	$ 8,482	$ 8,333
Regulatory, connectivity and produced content	612	546	1,770	1,639
Costs to service customers	1,894	1,854	5,483	5,492
Marketing	793	790	2,296	2,310
Mobile	337	94	874	135
Other	1,009	950	3,010	2,812
Operating costs and expenses (exclusive of items shown separately in the consolidated statements of operations)	$ 7,435	$ 7,012	$ 21,915	$ 20,721