Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Estimated Amortization Expense of Finite-Lived Intangible Assets
Accumulated Amortization	$ (23,545)	$ (19,825)
Total	116,491	114,579
Franchise rights
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	59,365	59,365
FCC licenses
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 2,807	2,804
Customer relationships
Estimated Amortization Expense of Finite-Lived Intangible Assets
Weighted-Average Original Useful Life	14 years
Gross Carrying Amount	$ 22,119	22,197
Accumulated Amortization	$ (10,612)	(8,914)
Software
Estimated Amortization Expense of Finite-Lived Intangible Assets
Weighted-Average Original Useful Life	5 years
Gross Carrying Amount	$ 20,329	17,819
Accumulated Amortization	$ (11,520)	(9,518)
Other agreements and rights
Estimated Amortization Expense of Finite-Lived Intangible Assets
Weighted-Average Original Useful Life	28 years
Gross Carrying Amount	$ 11,870	12,394
Accumulated Amortization	$ (1,413)	$ (1,393)