Financial Statements of Guarantors (Details 4) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Financial Statements of Guarantors
Net cash (used in) provided by operating activities	$ 819	$ 477
INVESTING ACTIVITIES
Payments for property, plant and equipment and capitalized software	(347)	(426)
Changes in advances to affiliates-notes	(1,027)	742
Net cash provided by (used in) investing activities	(1,374)	316
FINANCING ACTIVITIES
Payments of long-term debt	(38)	(840)
Changes in notes payable-affiliates	588	(122)
Net proceeds from (repayments of) affiliate accounts	(21)	170
Net cash provided by (used in) financing activities	529	(792)
Net increase in cash and cash equivalents	(26)	1
Cash and cash equivalents at beginning of period	87	48
Cash and cash equivalents at end of period	61	49
QCII
Financial Statements of Guarantors
Net cash (used in) provided by operating activities	(28)	(386)
INVESTING ACTIVITIES
Changes in advances to affiliates-notes	100	184
Net cash provided by (used in) investing activities	100	184
FINANCING ACTIVITIES
Payments of long-term debt		(800)
Changes in notes payable-affiliates	572	(123)
Net proceeds from (repayments of) affiliate accounts	(643)	1,125
Net cash provided by (used in) financing activities	(71)	202
Net increase in cash and cash equivalents	1
Cash and cash equivalents at beginning of period	11
Cash and cash equivalents at end of period	12
QSC and QCF
Financial Statements of Guarantors
Net cash (used in) provided by operating activities	185	187
INVESTING ACTIVITIES
Changes in advances to affiliates-notes	(87)	280
Changes in advances to affiliates-accounts		(468)
Net cash provided by (used in) investing activities	(87)	(188)
FINANCING ACTIVITIES
Changes in notes payable-affiliates	(18)
Net proceeds from (repayments of) affiliate accounts	(112)
Net cash provided by (used in) financing activities	(130)
Net increase in cash and cash equivalents	(32)	(1)
Cash and cash equivalents at beginning of period	59	40
Cash and cash equivalents at end of period	27	39
Subsidiaries Non-Guarantors
Financial Statements of Guarantors
Net cash (used in) provided by operating activities	661	689
INVESTING ACTIVITIES
Payments for property, plant and equipment and capitalized software	(347)	(426)
Changes in advances to affiliates-notes	13	278
Changes in advances to affiliates-accounts		(823)
Net cash provided by (used in) investing activities	(334)	(971)
FINANCING ACTIVITIES
Payments of long-term debt	(38)	(40)
Changes in notes payable-affiliates	16	324
Net proceeds from (repayments of) affiliate accounts	(300)
Net cash provided by (used in) financing activities	(322)	284
Net increase in cash and cash equivalents	5	2
Cash and cash equivalents at beginning of period	17	8
Cash and cash equivalents at end of period	22	10
Eliminations
Financial Statements of Guarantors
Net cash (used in) provided by operating activities	1	(13)
INVESTING ACTIVITIES
Changes in advances to affiliates-notes	(1,053)
Changes in advances to affiliates-accounts		1,291
Net cash provided by (used in) investing activities	(1,053)	1,291
FINANCING ACTIVITIES
Changes in notes payable-affiliates	18	(323)
Net proceeds from (repayments of) affiliate accounts	1,034	(955)
Net cash provided by (used in) financing activities	$ 1,052	$ (1,278)