Quarterly report pursuant to Section 13 or 15(d)

Segment Information (Details)

v2.4.0.6
Segment Information (Details) (USD $)
In Billions, unless otherwise specified
6 Months Ended
Mar. 31, 2013
Sep. 30, 2012
Notes to Financial Statements [Abstract]    
Number of divisions aggregated into the QWI segment 4  
Number of divisions aggregated into the QSI segment 2  
Revenues, EBT, and Assets for reportable segments [Line Items]    
QMT assets included in reconciling items $ 1.1 $ 1.2