Property and Equipment (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Property, Plant and Equipment [Line Items]
Gross property and equipment		$ 24,334	$ 22,216
Less: accumulated depreciation		(9,668)	(8,563)
Total property and equipment, net		14,666	13,653		$ 14,393	$ 14,128	$ 13,860	$ 13,410	$ 13,195	$ 13,028
Depreciation expense		1,100	1,100	$ 914
Land owned in fee and perpetual easements [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	[1]	2,080	1,981
Buildings [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment		$ 147	134
Property, Plant and Equipment, Useful Life		40 years
Communication Infrastructure [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment		$ 20,521	18,683
Property, Plant and Equipment, Useful Life		20 years
Information technology assets and other [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment		$ 506	443
Construction in Process [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment		$ 1,080	$ 975
Minimum [Member] | Communication Infrastructure [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life		1 year
Minimum [Member] | Information technology assets and other [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life		2 years
Maximum [Member] | Communication Infrastructure [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life		20 years
Maximum [Member] | Information technology assets and other [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life		7 years

[1] Includes land owned through fee interests and perpetual easements.