Revenues (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Revenue Recognition Non-cancelable Lease Term		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		$ 2,300		$ 2,300
Revenue Recognized on Deferred Revenues		110	$ 100
Contracted Amounts Receivable from Customers, Current	[1]	3,037
Contracted Amounts Receivable from Customers, in Two Years	[1]	3,862
Contracted Amounts Receivable from Customers, in Three Years	[1]	3,661
Contracted Amounts Receivable from Customers, in Four Years	[1]	3,431
Contracted Amounts Receivable from Customers, in Five Years	[1]	2,725
Contracted Amounts Receivable from Customers, Thereafter	[1]	6,887
Contracted Amounts Receivable from Customers, Total	[1]	23,603
Deferred Revenue [Domain]
Deferred Revenue		1,400
Other Current Assets [Member]
Deferred Revenue		$ 101

[1] Based on the nature of the contract, site rental contracts are accounted for pursuant to relevant lease accounting (ASC 842) or revenue accounting (ASC 606) guidance.