Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Operating Loss Carryforwards [Line Items]
Income Tax Expense (Benefit)	$ 12	$ 14	$ 37	$ 25
Income Taxes Percent Likelihood Of Being Realized Upon Settlement	50.00%		50.00%
Unrecognized Tax Benefits	$ 41		$ 41
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	$ 1
Other Comprehensive Income (Loss) [Member]
Operating Loss Carryforwards [Line Items]
Income Tax Expense (Benefit)			$ (14)