Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 45

-Paragraph 13

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (b)(1)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

Name:	us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Financial Statements of Guarantors (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2013
QSC and QCF
Financial Statements of Guarantors
Ownership percentage (percent)		100.00%
Amount of effect of overstating or understating of operating cash flows	$ (671)
QSC and QCF \| Payment guarantees \| QCII Guaranteed Notes
Financial Statements of Guarantors
Guaranteed principal outstanding debt instrument		800
QCII \| Payment guarantees \| QCF Guaranteed Notes
Financial Statements of Guarantors
Guaranteed principal outstanding debt instrument		981
Non-Guarantors
Financial Statements of Guarantors
Amount of effect of overstating or understating of operating cash flows	$ 671