Investments in and advances to non-consolidated affiliates (Details) (NC2 Global LLC [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Apr. 30, 2011	Apr. 30, 2011
NC2 Global LLC [Member]
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]
Net revenue	$ 30	$ 79
Net expenses	46	113
Loss before tax expense	(16)	(34)
Net loss	$ (16)	$ (34)