Operating Costs and Expenses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating Costs and Expenses [Abstract]
Programming	$ 2,803	$ 2,649	$ 5,555	$ 5,253
Regulatory, connectivity and produced content	560	532	1,093	1,030
Costs to service customers	1,784	1,762	3,638	3,562
Marketing	769	760	1,520	1,525
Mobile	33	0	41	0
Other	924	872	1,862	1,784
Operating costs and expenses (exclusive of items shown separately in the consolidated statements of operations)	$ 6,873	$ 6,575	$ 13,709	$ 13,154