Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2016	Jan. 31, 2015
Operating Loss Carryforwards [Line Items]
Income Tax Expense (Benefit)	$ (5)	$ 7
Income Taxes Percent Likelihood Of Being Realized Upon Settlement	50.00%
Unrecognized Tax Benefits	$ 41
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	1	$ 1
Other Comprehensive Income (Loss) [Member]
Operating Loss Carryforwards [Line Items]
Income Tax Expense (Benefit)	(12)
Alternative Minimum Tax [Member]
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	$ 13