Operating Costs and Expenses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Operating Costs and Expenses [Abstract]
Programming	$ 2,978	$ 2,873	$ 5,966	$ 5,765
Regulatory, connectivity and produced content	668	488	1,268	1,039
Costs to service customers	1,827	1,848	3,631	3,696
Marketing	741	719	1,492	1,485
Mobile	586	413	1,158	787
Other	1,082	956	2,078	1,957
Operating costs and expenses (exclusive of items shown separately in the consolidated statements of operations)	$ 7,882	$ 7,297	$ 15,593	$ 14,729