CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	3 Months Ended				12 Months Ended			6 Months Ended	12 Months Ended
	Mar. 31, 2014		Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2015		Dec. 31, 2013	Jul. 10, 2013	Dec. 31, 2012
Successor [Member]
Cash flows from operating activities:
Net loss	$ (151)		$ (9)	$ (27)	$ (3,345)		$ (1,860)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Asset impairments	75	[1]	0	0	2,133	[1]	0
Depreciation and amortization	1,297		0	0	5,349		2,934
Provision for losses on accounts receivable	153		0	0	892		261
Share-based and long-term incentive compensation expense	35		0	0	86		98
Deferred income tax (benefit) expense	46		(1)	1	(609)		32
Equity in losses of unconsolidated investments, net	0		0	0	0		0
Gain on previously-held equity interests	0		0	0	0		0
Amortization and accretion of long-term debt premiums and discounts	(74)		0	0	(303)		(160)
Other changes in assets and liabilities:
Accounts and notes receivable	(232)		(11)	(6)	(644)		(558)
Inventories and other current assets	173		0	0	(1,573)		(391)
Accounts payable and other current liabilities	(490)		8	3	481		25
Non-current assets and liabilities, net	(350)		0	0	(199)		(386)
Other, net	40		11	29	182		(56)
Net cash provided by (used in) operating activities	522		(2)	0	2,450		(61)
Cash flows from investing activities:
Capital expenditures - network and other	(1,488)		0	0	(5,422)		(3,847)
Capital expenditures - leased devices	0		0	0	(582)		0
Expenditures relating to FCC licenses	(152)		0	0	(163)		(146)
Reimbursements related to FCC licenses	0		0	0	95		0
Acquisitions, net of cash acquired	0		0	0	0		(14,112)
Investment in Clearwire (including debt securities)	0		0	0	0		0
Investment and derivative in Sprint Communications, Inc.	0		0	(3,100)	0		0
Proceeds from sales and maturities of short-term investments	920		0	0	3,131		1,715
Purchases of short-term investments	(1,035)		0	0	(2,077)		(1,719)
Proceeds from sale of assets and FCC licenses	1		0	0	315		7
Other, net	(2)		0	0	(11)		(6)
Net cash used in investing activities	(1,756)		0	(3,100)	(4,714)		(18,108)
Cash flows from financing activities:
Proceeds from debt and financings	0		0	0	1,930		9,500
Repayments of debt, financing and capital lease obligations	(159)		0	0	(574)		(3,378)
Debt financing costs	(1)		0	0	(87)		(147)
Proceeds from issuance of common stock and warrants, net	0		0	3,105	35		18,567
Other, net	0		0	0	0		(14)
Net cash provided by (used in) financing activities	(160)		0	3,105	1,304		24,528
Net (decrease) increase in cash and cash equivalents	(1,394)		(2)	5	(960)		6,359
Cash and cash equivalents, beginning of period	6,364		5	0	4,970		5	5
Cash and cash equivalents, end of period	4,970		3	5	4,010		6,364		5
Predecessor [Member]
Cash flows from operating activities:
Net loss			(643)					(1,158)	(4,326)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Asset impairments			0					0	102	[1]
Depreciation and amortization			1,492					3,245	6,543
Provision for losses on accounts receivable			83					194	561
Share-based and long-term incentive compensation expense			17					37	82
Deferred income tax (benefit) expense			24					1,586	209
Equity in losses of unconsolidated investments, net			202					482	1,114
Gain on previously-held equity interests			0					(2,926)	0
Amortization and accretion of long-term debt premiums and discounts			14					9	4
Other changes in assets and liabilities:
Accounts and notes receivable			215					150	(892)
Inventories and other current assets			243					298	(486)
Accounts payable and other current liabilities			(734)					280	577
Non-current assets and liabilities, net			16					207	(119)
Other, net			11					267	(370)
Net cash provided by (used in) operating activities			940					2,671	2,999
Cash flows from investing activities:
Capital expenditures - network and other			(1,381)					(3,140)	(4,261)
Capital expenditures - leased devices			0					0	0
Expenditures relating to FCC licenses			(55)					(125)	(198)
Reimbursements related to FCC licenses			0					0	0
Acquisitions, net of cash acquired			0					(4,039)	0
Investment in Clearwire (including debt securities)			(80)					(308)	(228)
Investment and derivative in Sprint Communications, Inc.			0					0	0
Proceeds from sales and maturities of short-term investments			1,281					2,445	1,513
Purchases of short-term investments			(926)					(1,221)	(3,212)
Proceeds from sale of assets and FCC licenses			6					10	19
Other, net			(3)					(7)	(8)
Net cash used in investing activities			(1,158)					(6,385)	(6,375)
Cash flows from financing activities:
Proceeds from debt and financings			204					204	9,176
Repayments of debt, financing and capital lease obligations			(59)					(362)	(4,791)
Debt financing costs			(10)					(11)	(134)
Proceeds from issuance of common stock and warrants, net			7					60	29
Other, net			0					0	0
Net cash provided by (used in) financing activities			142					(109)	4,280
Net (decrease) increase in cash and cash equivalents			(76)					(3,823)	904
Cash and cash equivalents, beginning of period			6,351				6,351	6,351	5,447
Cash and cash equivalents, end of period			$ 6,275	$ 6,351				$ 2,528	$ 6,351

[1] (2)Impairments for the Successor year ended March 31, 2015 consist of a $1.9 billion trade name impairment related to the Wireless segment and a $233 million impairment related to Wireline long-lived assets. Impairments for the Successor three-month transition period ended March 31, 2014 consist of network equipment assets no longer necessary for management's strategic plans. Impairments for the Predecessor year ended December 31, 2012 primarily consist of capitalized assets associated with the termination of the spectrum hosting arrangement with LightSquared.