Segment Information QWI Reportable Segment (Details) (USD $) In Millions	12 Months Ended
	Sep. 25, 2011	Sep. 26, 2010	Sep. 27, 2009
Revenues Aggregated into the QWI Reportable Segment [Line items]
Revenues aggregated into the QWI reportable segment	$ 656	$ 628	$ 641
QES [Member]
Revenues Aggregated into the QWI Reportable Segment [Line items]
Revenues aggregated into the QWI reportable segment	395	376	344
QIS [Member]
Revenues Aggregated into the QWI Reportable Segment [Line items]
Revenues aggregated into the QWI reportable segment	150	173	229
QGOV [Member]
Revenues Aggregated into the QWI Reportable Segment [Line items]
Revenues aggregated into the QWI reportable segment	100	74	66
Firethorn [Member]
Revenues Aggregated into the QWI Reportable Segment [Line items]
Revenues aggregated into the QWI reportable segment	11	7	3
Eliminations [Member]
Revenues Aggregated into the QWI Reportable Segment [Line items]
Revenues aggregated into the QWI reportable segment	$ 0	$ (2)	$ (1)