Financial Statements of Guarantors (Details 4) (USD $) In Millions, unless otherwise specified	0 Months Ended						1 Months Ended				6 Months Ended	9 Months Ended	12 Months Ended		9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended		3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Sep. 30, 2012	Feb. 25, 2011	Dec. 17, 2010	Sep. 24, 2010	Jun. 11, 2010	Mar. 12, 2010	Sep. 30, 2012	Jan. 31, 2012	Sep. 30, 2011	Jun. 30, 2011	Dec. 31, 2011	Dec. 31, 2011	Dec. 31, 2012	Mar. 31, 2011	Dec. 31, 2011 QCII	Dec. 31, 2012 QCII	Dec. 31, 2011 QSC and QCF	Dec. 31, 2012 QSC and QCF	Dec. 31, 2011 Subsidiaries Non-Guarantors	Dec. 31, 2012 Subsidiaries Non-Guarantors	Dec. 31, 2011 Eliminations	Dec. 31, 2012 Eliminations	Mar. 31, 2011 Predecessor	Dec. 31, 2010 Predecessor	Dec. 31, 2011 Predecessor	Mar. 31, 2011 Predecessor QCII	Dec. 31, 2010 Predecessor QCII	Mar. 31, 2011 Predecessor QSC and QCF	Dec. 31, 2010 Predecessor QSC and QCF	Mar. 31, 2011 Predecessor Subsidiaries Non-Guarantors	Dec. 31, 2010 Predecessor Subsidiaries Non-Guarantors	Mar. 31, 2011 Predecessor Eliminations	Dec. 31, 2010 Predecessor Eliminations
Financial Statements of Guarantors
Net cash (used in) provided by operating activities												$ 2,152	$ 2,806		$ (171)	$ (593)	$ 316	$ 756	$ 2,007	$ 2,656		$ (13)	$ 777	$ 3,367		$ 7	$ (358)	$ (62)	$ 514	$ 828	$ 3,106	$ 4	$ 105
INVESTING ACTIVITIES
Payments for property, plant and equipment and capitalized software												(1,207)	(1,589)						(1,207)	(1,589)			(410)	(1,488)						(410)	(1,488)
Changes in advances to affiliates												(663)	242		(184)	395	(277)	(820)	(240)	(714)	38	1,381						180	3,254	1	3	(181)	(3,257)
Dividends received from subsidiaries															770	1,025	990	1,150			(1,760)	(2,175)					2,320	590	2,611			(590)	(4,931)
Proceeds from sale of property or maturities of investment securities													133							133				943					943
Purchases of investment securities																								(944)					(944)
Changes in interest in investments managed by QSC																											10	(3)	7	3	(17)
Cash infusion to subsidiaries																	(555)				555							(191)	(577)			191	577
Other, net												2							2				2	1						2	1
Net cash used in investing activities												(1,868)	(1,214)		586	1,420	158	330	(1,445)	(2,170)	(1,167)	(794)	(408)	(1,488)			2,330	576	5,294	(404)	(1,501)	(580)	(7,611)
FINANCING ACTIVITIES
Net proceeds from (repayments of) short-term affiliate debt															(115)		153				(38)					119	5	(300)	(3,262)			181	3,257
Net proceeds from issuance of long-term debt												2,126	896						2,126	896				775			775
Payments of long-term debt												(2,402)	(3,335)			(1,851)			(2,402)	(1,484)			(203)	(3,379)			(1,790)	(179)	(1,025)	(24)	(564)
Early retirement of debt costs												(66)	(200)			(22)			(66)	(178)				(41)			(1)		(40)
Cash infusion from parent																			555		(555)									191	577	(191)	(577)
Dividends paid	(550)	(141)	(139)	(139)	(139)	(138)	(200)	(38)	(300)	(28)	(42)	(300)	(750)										(141)	(555)		(141)	(555)
Dividends paid to parent															(300)	(750)	(770)	(1,025)	(990)	(1,150)	1,760	2,175							(2,320)	(590)	(2,611)	590	4,931
Changes in notes payable-affiliate													2,023			1,322				701
Changes in accounts payable-affiliates													(187)			485		(42)		738		(1,368)
Net proceeds from issuance of common stock																							14	67		14	67
Purchases of treasury stock																								(136)			(136)
Settlement of embedded option in convertible debt																								(640)			(640)
Other, net												(18)							(18)				13	(4)		1	109			16	(8)	(4)	(105)
Net cash used in financing activities												(660)	(1,553)		(415)	(816)	(617)	(1,067)	(795)	(477)	1,167	807	(317)	(3,913)		(7)	(2,166)	(479)	(6,647)	(407)	(2,606)	576	7,506
Net increase in cash and cash equivalents												(376)	39			11	(143)	19	(233)	9			52	(2,034)			(194)	35	(839)	17	(1,001)
Cash and cash equivalents at beginning of period								48					48	424			183	40	241	8			372	2,406	48		194	148	987	224	1,225
Cash and cash equivalents at end of period											$ 48	$ 48	$ 87	$ 424		$ 11	$ 40	$ 59	$ 8	$ 17			$ 424	$ 372	$ 48			$ 183	$ 148	$ 241	$ 224