Income Taxes - Reconciliation of Income Tax to Statutory Income Tax (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2012
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 195	$ 341	$ 389
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	(4)	(4)	(6)
Effective Income Tax Rate Reconciliation, Tax Credit, Amount	(5)	0	10
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	(234)	(350)	(2,207)
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount	(37)	(8)	(17)
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount	15	(16)	11
Effective Income Tax Rate Reconciliation, Tax Expense related to Equity Components	13	220	0
Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Amount	14	19	17
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	17	(31)	23
Income Tax Expense (Benefit)	$ (26)	$ 171	$ (1,780)