Guarantor Financial Information (CONDENSED CONSOLIDATING BALANCE SHEET) (Details) (Successor [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012		Oct. 05, 2012
Current assets
Cash and cash equivalents, beginning of period	$ 4,010		$ 4,970		$ 6,364	$ 3	$ 5		$ 0
Short-term investments	166		1,220
Accounts and notes receivable, net	2,290		3,607
Device and accessory inventory	1,359		982
Current deferred tax asset	62		128
Prepaid expenses and other current assets	1,890		672
Total current assets	9,777		11,579
Investment in subsidiaries	0		0
Property, plant and equipment, net	19,721		16,299
Due from consolidated affiliate	0		0
Note receivable from consolidated affiliate	0		0
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	6,575		6,383		6,434
FCC licenses and other	39,987		41,978
Definite-lived intangible assets, net	5,893		7,558
Other assets	1,077		892
Total assets	83,030		84,689		86,095	3,122	3,115
Current liabilities
Accounts payable	4,347	[1]	3,163	[1]
Accrued expenses and other current liabilities	5,293		5,544
Current portion of long-term debt, financing and capital lease obligations	1,300		991
Total current liabilities	10,940		9,698
Long-term debt, financing and capital lease obligations	32,531		31,787
Deferred tax liabilities	13,898		14,207
Note due to consolidated affiliate	0		0
Other liabilities	3,951		3,685
Due to consolidated affiliate	0		0
Total liabilities	61,320		59,377
Commitments and contingencies
Total stockholders' equity	21,710		25,312		25,584		3,110	[2]	0	[2]
Total liabilities and stockholders' equity	83,030		84,689
Parent [Member]
Current assets
Cash and cash equivalents, beginning of period	0		0		0		5
Short-term investments	0		0
Accounts and notes receivable, net	84		74
Device and accessory inventory	0		0
Current deferred tax asset	0		0
Prepaid expenses and other current assets	0		0
Total current assets	84		74
Investment in subsidiaries	21,712		25,316
Property, plant and equipment, net	0		0
Due from consolidated affiliate	68		0
Note receivable from consolidated affiliate	10,500		9,000
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	0		0
FCC licenses and other	0		0
Definite-lived intangible assets, net	0		0
Other assets	139		133
Total assets	32,503		34,523
Current liabilities
Accounts payable	0		0
Accrued expenses and other current liabilities	154		78
Current portion of long-term debt, financing and capital lease obligations	0		0
Total current liabilities	154		78
Long-term debt, financing and capital lease obligations	10,500		9,000
Deferred tax liabilities	0		0
Note due to consolidated affiliate	0		0
Other liabilities	0		0
Due to consolidated affiliate	139		133
Total liabilities	10,793		9,211
Total stockholders' equity	21,710		25,312
Total liabilities and stockholders' equity	32,503		34,523
Guarantor Subsidiaries [Member]
Current assets
Cash and cash equivalents, beginning of period	3,492		4,125		5,665		0
Short-term investments	146		1,220
Accounts and notes receivable, net	157		27
Device and accessory inventory	0		0
Current deferred tax asset	0		0
Prepaid expenses and other current assets	13		14
Total current assets	3,808		5,386
Investment in subsidiaries	22,413		25,588
Property, plant and equipment, net	0		0
Due from consolidated affiliate	20,934		18,234
Note receivable from consolidated affiliate	458		0
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	0		0
FCC licenses and other	0		0
Definite-lived intangible assets, net	0		0
Other assets	1,260		1,237
Total assets	48,873		50,445
Current liabilities
Accounts payable	0		0
Accrued expenses and other current liabilities	625		493
Current portion of long-term debt, financing and capital lease obligations	500		0
Total current liabilities	1,125		493
Long-term debt, financing and capital lease obligations	14,576		15,027
Deferred tax liabilities	0		0
Note due to consolidated affiliate	10,500		9,000
Other liabilities	960		609
Due to consolidated affiliate	0		0
Total liabilities	27,161		25,129
Total stockholders' equity	21,712		25,316
Total liabilities and stockholders' equity	48,873		50,445
Non-Guarantor Subsidiaries [Member]
Current assets
Cash and cash equivalents, beginning of period	518		845		699		0
Short-term investments	20		0
Accounts and notes receivable, net	2,160		3,607
Device and accessory inventory	1,359		982
Current deferred tax asset	62		128
Prepaid expenses and other current assets	1,877		658
Total current assets	5,996		6,220
Investment in subsidiaries	0		0
Property, plant and equipment, net	19,721		16,299
Due from consolidated affiliate	0		0
Note receivable from consolidated affiliate	0		0
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	6,575		6,383
FCC licenses and other	39,987		41,978
Definite-lived intangible assets, net	5,893		7,558
Other assets	836		674
Total assets	79,008		79,112
Current liabilities
Accounts payable	4,347		3,163
Accrued expenses and other current liabilities	4,625		5,074
Current portion of long-term debt, financing and capital lease obligations	800		991
Total current liabilities	9,772		9,228
Long-term debt, financing and capital lease obligations	8,474		8,779
Deferred tax liabilities	13,898		14,207
Note due to consolidated affiliate	458		0
Other liabilities	2,991		3,076
Due to consolidated affiliate	21,002		18,234
Total liabilities	56,595		53,524
Total stockholders' equity	22,413		25,588
Total liabilities and stockholders' equity	79,008		79,112
Consolidation, Eliminations [Member]
Current assets
Cash and cash equivalents, beginning of period	0		0		0		0
Short-term investments	0		0
Accounts and notes receivable, net	(111)		(101)
Device and accessory inventory	0		0
Current deferred tax asset	0		0
Prepaid expenses and other current assets	0		0
Total current assets	(111)		(101)
Investment in subsidiaries	(44,125)		(50,904)
Property, plant and equipment, net	0		0
Due from consolidated affiliate	(21,002)		(18,234)
Note receivable from consolidated affiliate	(10,958)		(9,000)
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	0		0
FCC licenses and other	0		0
Definite-lived intangible assets, net	0		0
Other assets	(1,158)		(1,152)
Total assets	(77,354)		(79,391)
Current liabilities
Accounts payable	0		0
Accrued expenses and other current liabilities	(111)		(101)
Current portion of long-term debt, financing and capital lease obligations	0		0
Total current liabilities	(111)		(101)
Long-term debt, financing and capital lease obligations	(1,019)		(1,019)
Deferred tax liabilities	0		0
Note due to consolidated affiliate	(10,958)		(9,000)
Other liabilities	0		0
Due to consolidated affiliate	(21,141)		(18,367)
Total liabilities	(33,229)		(28,487)
Total stockholders' equity	(44,125)		(50,904)
Total liabilities and stockholders' equity	$ (77,354)		$ (79,391)

[1] Includes liabilities in the amounts of $90 million and $91 million as of March 31, 2015 and 2014, respectively, for checks issued in excess of associated bank balances but not yet presented for collection.

[2] (1)For the Successor period beginning October 5, 2012 and ending December 31, 2012, there were approximately 3 million shares of Class B common stock of Starburst II, Inc. issued and outstanding with an immaterial value. These shares were exchanged in connection with the issuance of common stock to SoftBank upon completion of the Merger.