Property and Equipment (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Gross property and equipment		$ 29,945	$ 28,478
Less: accumulated depreciation		(14,279)	(13,071)
Total property and equipment, net		15,666	15,407
Depreciation expense		$ 1,300	1,200	$ 1,200
AT&T weighted-average initial term		28 years
at&T		22.00%
T-Mobile leased or subleased, or operated and managed towers		31.00%
T-Mobile weighted-average initial term		28 years
T-Mobile weighted-average initial term, option to purchase in 2037		32 years
AT&T purchase option 2032 through 2048
Property, Plant and Equipment [Line Items]
Contractual Obligation		$ 4,200
T-Mobile Purchase obligation 2037
Property, Plant and Equipment [Line Items]
Contractual Obligation		2,300
T-Mobile purchase option 2035 through 2049
Property, Plant and Equipment [Line Items]
Contractual Obligation		2,000
AT&T purchase option prior to 2032
Property, Plant and Equipment [Line Items]
Contractual Obligation		400
AT&T purchase option prior to 2029
Property, Plant and Equipment [Line Items]
Contractual Obligation		15
Land owned in fee and perpetual easements [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment	[1]	2,442	2,339
Buildings [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment		$ 209	221
Property, Plant and Equipment, Useful Life		40 years
Communication Infrastructure [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment		$ 25,479	24,353
Information technology assets and other [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment		681	652
Construction in Process [Member]
Property, Plant and Equipment [Line Items]
Gross property and equipment		$ 1,134	$ 913
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.