Guarantor Financial Information CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		0 Months Ended		3 Months Ended		0 Months Ended	3 Months Ended	0 Months Ended	3 Months Ended	0 Months Ended	3 Months Ended
	Sep. 30, 2014 Successor [Member]	Sep. 30, 2013 Successor [Member]	Sep. 30, 2014 Successor [Member]	Sep. 30, 2013 Successor [Member]	Sep. 30, 2014 Successor [Member] Guarantor Subsidiaries [Member]	Sep. 30, 2013 Successor [Member] Guarantor Subsidiaries [Member]	Sep. 30, 2014 Successor [Member] Guarantor Subsidiaries [Member]	Sep. 30, 2013 Successor [Member] Guarantor Subsidiaries [Member]	Sep. 30, 2014 Successor [Member] Non-Guarantor Subsidiaries [Member]	Sep. 30, 2013 Successor [Member] Non-Guarantor Subsidiaries [Member]	Sep. 30, 2014 Successor [Member] Non-Guarantor Subsidiaries [Member]	Sep. 30, 2013 Successor [Member] Non-Guarantor Subsidiaries [Member]	Sep. 30, 2014 Successor [Member] Consolidation, Eliminations [Member]	Sep. 30, 2013 Successor [Member] Consolidation, Eliminations [Member]	Sep. 30, 2014 Successor [Member] Consolidation, Eliminations [Member]	Sep. 30, 2013 Successor [Member] Consolidation, Eliminations [Member]	Sep. 30, 2014 Successor [Member] Parent Company [Member]	Sep. 30, 2013 Successor [Member] Parent Company [Member]	Sep. 30, 2014 Successor [Member] Parent Company [Member]	Sep. 30, 2013 Successor [Member] Parent Company [Member]	Jul. 08, 2013 Predecessor [Member]	Jul. 10, 2013 Predecessor [Member]	Jul. 09, 2013 Predecessor [Member]	Jul. 10, 2013 Predecessor [Member]	Jul. 10, 2013 Predecessor [Member] Guarantor Subsidiaries [Member]	Jul. 10, 2013 Predecessor [Member] Guarantor Subsidiaries [Member]	Jul. 10, 2013 Predecessor [Member] Non-Guarantor Subsidiaries [Member]	Jul. 10, 2013 Predecessor [Member] Non-Guarantor Subsidiaries [Member]	Jul. 10, 2013 Predecessor [Member] Consolidation, Eliminations [Member]	Jul. 10, 2013 Predecessor [Member] Consolidation, Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Revenues	$ 8,488	$ 7,749	$ 17,277	$ 7,749	$ 0	$ 0	$ 0	$ 0	$ 8,488	$ 7,749	$ 17,277	$ 7,749	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0		$ 932		$ 9,809	$ 0	$ 0	$ 932	$ 9,809	$ 0	$ 0
Net operating expenses
Cost of services and products (exclusive of depreciation and amortization included below)	4,801	4,342	9,479	4,342	0	0	0	0	4,801	4,342	9,479	4,342	0	0	0	0	0	0	0	0		567		5,612	0	0	567	5,612	0	0
Selling, general and administrative	2,301	2,259	4,585	2,281	0	0	0	0	2,301	2,259	4,585	2,259	0	0	0	0	0	0	0	22		289		2,731	0	0	289	2,731	0	0
Severance and exit costs	284	103	311	103	0	0	0	0	284	103	311	103	0	0	0	0	0	0	0	0		(5)		627	0	0	(5)	627	0	0
Depreciation	898	942	1,766	942	0	0	0	0	898	942	1,766	942	0	0	0	0	0	0	0	0		113		1,676	0	0	113	1,676	0	0
Amortization	396	461	809	461	0	0	0	0	396	461	809	461	0	0	0	0	0	0	0	0		8		77	0	0	8	77	0	0
Total costs and expenses	8,680	8,107	16,950	8,129	0	0	0	0	8,680	8,107	16,950	8,107	0	0	0	0	0	0	0	22		972		10,723	0	0	972	10,723	0	0
Operating Income (Loss)	(192)	(358)	327	(380)	0	0	0	0	(192)	(358)	327	(358)	0	0	0	0	0	0	0	(22)		(40)		(914)	0	0	(40)	(914)	0	0
Other (expense) income
Interest Income	4	4	7	17	23	20	46	20	1	2	1	1	(189)	(45)	(378)	(45)	169	27	338	41		1		18	3	32	0	8	(2)	(22)
Interest Expense	(510)	(416)	(1,022)	(416)	(364)	(214)	(732)	(214)	(166)	(221)	(330)	(221)	189	45	378	45	(169)	(26)	(338)	(26)		(275)		(703)	(259)	(550)	(18)	(175)	2	22
Income (Loss) from Equity Method Investments	0	0	0	0																	(23)	(23)	(280)	(280)	0	0	(23)	(280)	0	0
Gain on previously-held equity interests	0	0	0	0																		2,926		2,926	0	0	2,926	2,926	0	0
(Losses) earnings of Subsidiaries	0	0	0	0	(424)	(603)	(56)	(603)	0	0	0	0	1,189	1,398	798	1,398	(765)	(795)	(742)	(795)		0		0	1,338	3	0	0	(1,338)	(3)
Other income, net	4	161	2	(5)	0	2	0	2	4	0	2	1	0	0	0	0	0	159	0	(8)		1		1	0	0	1	1	0	0
Nonoperating Income (Expense)	(502)	(251)	(1,013)	(404)	(765)	(795)	(742)	(795)	(161)	(219)	(327)	(219)	1,189	1,398	798	1,398	(765)	(635)	(742)	(788)		2,630		1,962	1,082	(515)	2,886	2,480	(1,338)	(3)
Loss (income) before income taxes	(694)	(609)	(686)	(784)	(765)	(795)	(742)	(795)	(353)	(577)	0	(577)	1,189	1,398	798	1,398	(765)	(635)	(742)	(810)		2,590		1,048	1,082	(515)	2,846	1,566	(1,338)	(3)
Income tax expense	(71)	(90)	(56)	(29)	0	0	0	0	(71)	(26)	(56)	(26)	0	0	0	0	0	(64)	0	(3)		(1,508)		(1,563)	0	0	(1,508)	(1,563)	0	0
Net (loss) income	(765)	(699)	(742)	(813)	(765)	(795)	(742)	(795)	(424)	(603)	(56)	(603)	1,189	1,398	798	1,398	(765)	(699)	(742)	(813)		1,082		(515)	1,082	(515)	1,338	3	(1,338)	(3)
Other Comprehensive Income (Loss), Net of Tax	(7)	4	(7)	100	(7)	4	(7)	100	(1)	0	(1)	0	8	(4)	8	(100)	(7)	4	(7)	100		(42)		9	(42)	9	5	20	(5)	(20)
Comprehensive (loss) income	$ (772)	$ (695)	$ (749)	$ (713)	$ (772)	$ (791)	$ (749)	$ (695)	$ (425)	$ (603)	$ (57)	$ (603)	$ 1,197	$ 1,394	$ 806	$ 1,298	$ (772)	$ (695)	$ (749)	$ (713)		$ 1,040		$ (506)	$ 1,040	$ (506)	$ 1,343	$ 23	$ (1,343)	$ (23)