Financial Statements of Guarantors (Details 4) (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	3 Months Ended
	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011 QCII	Jun. 30, 2012 QCII	Jun. 30, 2011 QSC and QCF	Jun. 30, 2012 QSC and QCF	Jun. 30, 2012 Subsidiaries Non-Guarantors	Jun. 30, 2011 Subsidiaries Non-Guarantors	Jun. 30, 2012 Subsidiaries Non-Guarantors	Jun. 30, 2011 Eliminations	Jun. 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
Financial Statements of Guarantors
Net cash (used in) provided by operating activities	$ 700	$ 1,078	$ (76)	$ (415)	$ 213	$ (141)		$ 563	$ 1,647		$ (13)	$ 777	$ 7	$ (62)	$ 828	$ 4
INVESTING ACTIVITIES
Payments for property, plant and equipment and capitalized software	(347)	(752)						(347)	(752)			(410)			(410)
Changes in interest in investments managed by QSC														(3)	3
Cash infusion to subsidiaries					(168)					168				(191)		191
Changes in advances to affiliates	(511)	669		184	(243)	128		(272)	(1,422)	4	1,779			180	1	(181)
Proceeds from sale of property		133							133
Dividends received from subsidiaries					120					(120)				590		(590)
Other, net	2							2				2			2
Net cash provided by (used in) investing activities	(856)	50		184	(291)	128		(617)	(2,041)	52	1,779	(408)		576	(404)	(580)
FINANCING ACTIVITIES
Net proceeds from issuance of long-term debt	643	897						643	897
Payments of long-term debt	(851)	(2,251)		(1,299)				(851)	(952)			(203)		(179)	(24)
Early retirement of debt costs	(13)	(177)		(49)			(13)	(13)	(128)
Notes payable-affiliates		583							583
Accounts payable-affiliates		(187)		1,579							(1,766)
Dividends paid to parent								(120)		120					(590)	590
Net proceeds from (repayments of) short-term affiliate debt			76		(72)					(4)			119	(300)		181
Dividends paid												(141)	(141)
Cash infusion from parent								168		(168)					191	(191)
Other, net												27	15		16	(4)
Net cash used in financing activities	(221)	(1,135)	76	231	(72)			(173)	400	(52)	(1,766)	(317)	(7)	(479)	(407)	576
Net (decrease) increase in cash and cash equivalents	(377)	(7)			(150)	(13)		(227)	6			52		35	17
Cash and cash equivalents at beginning of period	424	48			183	40		241	8			372		148	224
Cash and cash equivalents at end of period	$ 47	$ 41			$ 33	$ 27	$ 14	$ 14	$ 14			$ 424		$ 183	$ 241