Financial Statements of Guarantors (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended	9 Months Ended	3 Months Ended		6 Months Ended	9 Months Ended	3 Months Ended		6 Months Ended	9 Months Ended	3 Months Ended		6 Months Ended	9 Months Ended	3 Months Ended		6 Months Ended	9 Months Ended	3 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2012 QCII	Sep. 30, 2011 QCII	Sep. 30, 2011 QCII	Sep. 30, 2012 QCII	Sep. 30, 2012 QSC and QCF	Sep. 30, 2011 QSC and QCF	Sep. 30, 2011 QSC and QCF	Sep. 30, 2012 QSC and QCF	Sep. 30, 2012 Subsidiaries Non-Guarantors	Sep. 30, 2011 Subsidiaries Non-Guarantors	Sep. 30, 2011 Subsidiaries Non-Guarantors	Sep. 30, 2012 Subsidiaries Non-Guarantors	Sep. 30, 2012 Eliminations	Sep. 30, 2011 Eliminations	Sep. 30, 2011 Eliminations	Sep. 30, 2012 Eliminations	Mar. 31, 2011 Predecessor	Mar. 31, 2011 Predecessor QCII	Mar. 31, 2011 Predecessor QSC and QCF	Mar. 31, 2011 Predecessor Subsidiaries Non-Guarantors	Mar. 31, 2011 Predecessor Eliminations
OPERATING REVENUES
Operating revenues	$ 2,712	$ 2,744	$ 5,507	$ 8,173									$ 2,712	$ 2,744	$ 5,507	$ 8,173					$ 2,846			$ 2,846
Operating revenues-affiliates	113	21	27	327						2	5	3	113	29	44	327		(10)	(22)	(3)			2	9	(11)
Total operating revenues	2,825	2,765	5,534	8,500						2	5	3	2,825	2,773	5,551	8,500		(10)	(22)	(3)	2,846		2	2,855	(11)
OPERATING EXPENSES
Cost of services and products (exclusive of depreciation and amortization)	1,227	1,185	2,326	3,615									1,227	1,185	2,326	3,615					1,178			1,178
Selling, general and administrative	384	525	1,181	1,312	2	3	8	5		2	5	3	382	520	1,168	1,304					556	3	2	551
Operating expenses-affiliates	165	36	68	464									165	46	90	467		(10)	(22)	(3)				11	(11)
Depreciation and amortization	727	796	1,598	2,206	15	20	42	49					712	776	1,556	2,157					533			533
Total operating expenses	2,503	2,542	5,173	7,597	17	23	50	54		2	5	3	2,486	2,527	5,140	7,543		(10)	(22)	(3)	2,267	3	2	2,273	(11)
OPERATING (LOSS) INCOME	322	223	361	903	(17)	(23)	(50)	(54)					339	246	411	957					579	(3)		582
OTHER INCOME (EXPENSE)
Interest expense	(147)	(158)	(308)	(471)	(21)	(43)	(87)	(85)	(17)	(17)	(35)	(51)	(109)	(98)	(186)	(335)					(227)	(56)	(19)	(152)
Interest expense-affiliates	(37)			(71)	(26)	(4)	(8)	(48)	(28)	(22)	(45)	(82)	(11)		1	(22)	28	26	52	81		(1)	(26)	(1)	28
Interest income-affiliates									28	26	52	81					(28)	(26)	(52)	(81)			28		(28)
Income from equity investments in subsidiaries					144	90	157	361	75	18	(34)	135					(219)	(108)	(123)	(496)		272	226		(498)
Net gain (loss) on early retirement of debt	(1)		(1)	(38)	12			12					(13)		(1)	(50)
Other (expense) income				3	(14)	(1)	(1)	(1)		(1)	(1)		14	2	2	4					5		(1)	6
Total other income (expense)	(185)	(158)	(309)	(577)	95	42	61	239	58	4	(63)	83	(119)	(96)	(184)	(403)	(219)	(108)	(123)	(496)	(222)	215	208	(147)	(498)
INCOME BEFORE INCOME TAX EXPENSE	137	65	52	326	78	19	11	185	58	4	(63)	83	220	150	227	554	(219)	(108)	(123)	(496)	357	212	208	435	(498)
Income tax (benefit) expense	54	33	33	129	(5)	(13)	(8)	(12)	(86)	(84)	(215)	(278)	145	130	256	419					146	1	(64)	209
NET INCOME	83	32	19	197	83	32	19	197	144	88	152	361	75	20	(29)	135	(219)	(108)	(123)	(496)	211	211	272	226	(498)
COMPREHENSIVE INCOME	$ 83	$ 32	$ 19	$ 197	$ 83	$ 32	$ 19	$ 197	$ 144	$ 88	$ 152	$ 361	$ 75	$ 20	$ (29)	$ 135	$ (219)	$ (108)	$ (123)	$ (496)	$ 218	$ 218	$ 272	$ 226	$ (498)