Customer Concentration (Details)	12 Months Ended
	Dec. 31, 1999 renewal megahertz
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Megahertz spectrum used	2,500
Initial term of contract	2029 years
Number of contract renewals | renewal	2
Length of renewals	10 years
Right or obligation to sell business, percentage of EBV	90.00%
Maximum
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Megahertz spectrum used	1,900
Minimum
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Megahertz spectrum used	800