CONSOLIDATED BALANCE SHEETS (Successor [Member], USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Mar. 31, 2014
Successor [Member]
Current Assets
Cash and Cash Equivalents	$ 4,171	$ 4,970
Short-term Investments	1,322	1,220
Accounts and notes receivable, net of allowance for doubtful accounts and deferred interest of $254 and $197	3,751	3,607
Device and accessory inventory	1,116	982
Current deferred tax asset	78	128
Prepaid expenses and other current assets	936	672
Total current assets	11,374	11,579
Property, plant and equipment, net	16,852	16,299
Intangible assets
Goodwill	6,343	6,383
FCC licenses and other	41,764	41,978
Definite-lived intangible assets, net	7,119	7,558
Investments and Other Noncurrent Assets	967	892
Total assets	84,419	84,689
Current Liabilities
Accounts payable	3,492	3,163
Accrued expenses and other current liabilities	5,137	5,544
Current portion of long-term debt, financing and capital lease obligations	807	991
Total current liabilities	9,436	9,698
Long-term debt, financing and capital lease obligations	31,687	31,787
Deferred Tax Liabilities, Net, Noncurrent	14,268	14,207
Other liabilities	3,664	3,685
Total liabilities	59,055	59,377
Commitments and contingencies
Shareholders' Equity
Common shares	39	39
Paid-in capital	27,383	27,354
Accumulated deficit	(2,015)	(2,038)
Accumulated other comprehensive income (loss)	(43)	(43)
Total shareholders' equity	25,364	25,312
Liabilities and Equity	$ 84,419	$ 84,689