Investments in and advances to non-consolidated affiliates (Details) (NC2 Global LLC [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Jul. 31, 2011	Jul. 31, 2011
NC2 Global LLC [Member]
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]
Net revenue	$ 82	$ 161
Net expenses	105	218
Loss before tax expense	(23)	(57)
Net loss	$ (24)	$ (58)