CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Jul. 10, 2013	Mar. 31, 2016	Mar. 31, 2015		Dec. 31, 2013
Net operating expenses:
Impairments				$ 166
Depreciation				1,800	$ 206
Other (expense) income:
Income tax benefit (expense)			$ (1,600)
Successor [Member]
Net operating revenues:
Service	$ 7,876	$ 0		27,174	29,542		$ 15,094
Equipment	999	0		5,006	4,990		1,797
Net operating revenues	8,875	0		32,180	34,532		16,891
Net operating expenses:
Cost of services (exclusive of depreciation and amortization below)	2,622	0		9,439	9,660		5,174
Cost of products (exclusive of depreciation and amortization below)	2,038	0		5,795	9,309		4,603
Selling, general and administrative	2,371	14		8,479	9,563		4,841
Impairments	0	0		0	2,133	[1]	0
Severance and exit costs	52	0		409	304		309
Depreciation	868	0		5,794	3,797		2,026
Amortization	429	0		1,294	1,552		908
Other, net	75	0		660	109		0
Total costs and expenses	8,455	14		31,870	36,427		17,861
Operating (loss) income	420	(14)		310	(1,895)		(970)
Other (expense) income:
Interest expense	(516)	0		(2,182)	(2,051)		(918)
Equity in losses of unconsolidated investments, net	0	0		0	0		0
Gain on previously-held equity interests	0	0		0	0		0
Other income (expense), net	1	6		18	27		73
Nonoperating income (expense)	(515)	6		(2,164)	(2,024)		(845)
Loss (income) before income taxes	(95)	(8)		(1,854)	(3,919)		(1,815)
Income tax benefit (expense)	(56)	(1)		(141)	574		(45)
Net loss	$ (151)	(9)		$ (1,995)	$ (3,345)		$ (1,860)
Basic and diluted net loss per common share	$ (0.04)			$ (0.50)	$ (0.85)		$ (0.54)
Basic and diluted weighted average common shares outstanding	3,949			3,969	3,953		3,475
Predecessor [Member]
Net operating revenues:
Service		7,980	16,895
Equipment		813	1,707
Net operating revenues		8,793	18,602
Net operating expenses:
Cost of services (exclusive of depreciation and amortization below)		2,640	5,673
Cost of products (exclusive of depreciation and amortization below)		2,293	4,872
Selling, general and administrative		2,336	5,067
Impairments		0	0
Severance and exit costs		25	652
Depreciation		1,422	3,098
Amortization		70	147
Other, net		(22)	(22)
Total costs and expenses		8,764	19,487
Operating (loss) income		29	(885)
Other (expense) income:
Interest expense		(432)	(1,135)
Equity in losses of unconsolidated investments, net		(202)	(482)
Gain on previously-held equity interests		0	2,926
Other income (expense), net		0	19
Nonoperating income (expense)		(634)	1,328
Loss (income) before income taxes		(605)	443
Income tax benefit (expense)		(38)	(1,601)
Net loss		$ (643)	$ (1,158)
Basic and diluted net loss per common share		$ (0.21)	$ (0.38)
Basic and diluted weighted average common shares outstanding		3,013	3,027

[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.