Revenues (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Revenue Recognition Non-cancelable Lease Term for Wireless Tenants		five to 15 years
Revenue Recognition for Fiber Solutions Tenants		three to 20 years
Revenue, Performance Obligation, Description of Payment Terms		45 to 60 days
Revenue, Remaining Performance Obligation, Amount		$ 2,800		$ 2,900
Revenue Recognized on Deferred Revenues		160	$ 135
Contracted Amounts Receivable from Customers, remaining three months	[1]	3,257
Contracted Amounts Receivable from Customers, in Two Years	[1]	4,071
Contracted Amounts Receivable from Customers, in Three Years	[1]	3,842
Contracted Amounts Receivable from Customers, in Four Years	[1]	3,213
Contracted Amounts Receivable from Customers, in Five Years	[1]	2,489
Contracted Amounts Receivable from Customers, Thereafter	[1]	7,219
Contracted Amounts Receivable from Customers, Total	[1]	24,091
Deferred Revenue [Domain]
Deferred Revenue		1,400
Other Current Assets [Member]
Deferred Revenue		$ 123

[1] Based on the nature of the contract, tenant contracts are accounted for pursuant to relevant lease accounting (ASC 842) or revenue accounting (ASC 606) guidance. Excludes amounts related to services, as those contracts generally have a duration of one year or less.