CONSOLIDATED BALANCE SHEETS (Successor [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Mar. 31, 2014
Successor [Member]
Current Assets
Cash and Cash Equivalents	$ 4,135	$ 4,970
Short-term Investments	1,167	1,220
Accounts and notes receivable, net of allowance for doubtful accounts and deferred interest of $303 and $197	3,942	3,607
Device and accessory inventory	1,124	982
Current deferred tax asset	90	128
Prepaid expenses and other current assets	812	672
Total current assets	11,270	11,579
Property, plant and equipment, net	17,557	16,299
Intangible assets
Goodwill	6,343	6,383
FCC licenses and other	41,800	41,978
Definite-lived intangible assets, net	6,696	7,558
Investments and Other Noncurrent Assets	1,044	892
Total assets	84,710	84,689
Current Liabilities
Accounts payable	4,351	3,163
Accrued expenses and other current liabilities	5,439	5,544
Current portion of long-term debt, financing and capital lease obligations	808	991
Total current liabilities	10,598	9,698
Long-term debt, financing and capital lease obligations	31,458	31,787
Deferred tax liabilities	14,331	14,207
Other liabilities	3,660	3,685
Total liabilities	60,047	59,377
Commitments and contingencies
Shareholders' Equity
Common stock, voting, par value $0.01 per share, 9.0 billion authorized, 3.955 billion and 3.941 billion issued at September 30, 2014 and March 31, 2014	40	39
Paid-in capital	27,453	27,354
Accumulated deficit	(2,780)	(2,038)
Accumulated other comprehensive income (loss)	(50)	(43)
Total shareholders' equity	24,663	25,312
Liabilities and Equity	$ 84,710	$ 84,689