Basis of Presentation (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Ground Lease Agreement Initial Term	five years
Subject to Capital Lease with Sprint, TMO, or AT&T [Member]
Tower count as a percentage of total towers	53.00%
Leased or Operated Under Sprint Agreement [Member]
Ground Lease Agreement Initial Term	32
Purchase Option Price	$ 2,300
Tower count as a percentage of total towers	16.00%
Leased or Operated Under T-Mobile Agreement [Member]
Ground Lease Agreement Initial Term	28
Tower count as a percentage of total towers	15.00%
T-Mobile [Member]
Purchase Option Price	$ 2,000
AT&T lease or sublease in accordance with TMO Agreement [Member]
Purchase Option Price	$ 405
Tower count as a percentage of total towers	0.00%
AT&T Prior to 2025 in accordance with TMO agreement [Member]
Purchase Option Price	$ 10
AT&T [Member]
Ground Lease Agreement Initial Term	28
Purchase Option Price	$ 4,200
Tower count as a percentage of total towers	22.00%