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Related Party Transactions Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified		3 Months Ended				3 Months Ended
	Jul. 08, 2013 Clearwire [Member]	Jun. 30, 2013 Predecessor [Member]	Jun. 30, 2014 Successor [Member]	Jun. 30, 2013 Successor [Member]	Mar. 31, 2014 Successor [Member]	Jun. 30, 2014 Successor [Member] SoftBank [Member]	Mar. 31, 2014 Successor [Member] SoftBank [Member]	Jul. 08, 2013 Non-controlling economic interest [Member] Clearwire Corporation [Member]	Jul. 08, 2013 Non-controlling economic interest [Member] Clearwire Communications LLC [Member]	Jul. 08, 2013 Non-controlling economic interest [Member] Clearwire Acquisition [Member]
Related Party Transaction [Line Items]
Equity Method Investment, Ownership Percentage								6.00%	44.10%	50.10%
Related Party Transaction, Amounts of Transaction		$ 95				$ 1,400
Short-term Investments			1,322		1,220	755	266
Accounts Payable, Related Parties, Current						589	205
Equity Method Investments	325
Income (Loss) from Equity Method Investments		(257)	0	0
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net		$ 65