Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Operating Loss Carryforwards [Line Items]
Income Taxes Percent Likelihood Of Being Realized Upon Settlement	50.00%
Income tax expense	$ (4)	$ 5
Unrecognized Tax Benefits	49
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	1	$ 1
Other Comprehensive Income (Loss) [Member]
Operating Loss Carryforwards [Line Items]
Income tax expense	$ 12