Commitments and Contingencies (Narrative) (Details) (USD $)	0 Months Ended		3 Months Ended	6 Months Ended
	Apr. 19, 2012	Sep. 30, 2014	Jun. 30, 2014 Successor [Member]	Sep. 30, 2014 Successor [Member]	Oct. 06, 2014 Subsequent Event [Member] Unsecured Revolving Credit Facility expires in 2018 [Member] Letter Of Credit Required By The FCCs Report And Order [Member]
Commitments and Contingencies [Line Items]
Sales receipts alleged to not be reported, amount	$ 100,000,000
Minimum spectrum reconfiguration obligations		2,800,000,000
Letter of Credit, Minimum		850,000,000
Letters of Credit Outstanding, Amount					457,000,000
Licensees reimbursed share of costs			95,000,000
Total Payments directly attributable to performance under Report and Order		3,400,000,000
Payments directly attributable to performance under report and order, net change related to FCC licenses				73,000,000
Maximum amount of the guarantee liability		$ 429,000,000