Income Taxes - Reconciliation of Statutory Federal Income Tax Benefit (Expense) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2011
Income Tax Disclosure [Abstract]
Federal income tax benefit (expense) at the statutory rate of 35%	$ (341)	$ (389)	$ 155
State income taxes, net of federal benefit	4	6	4
Credits and incentives	0	10	27
Adjustments to valuation allowances	350	2,207	(1,499)
Foreign operations	8	17	19
Adjustments to uncertain tax positions	16	(11)	(42)
Effective Income Tax Rate Reconciliation, Tax Expense related to Equity Components	220	0	0
Non-controlling interest adjustment	19	17	19
Other	31	(23)	(8)
Recorded income tax benefit (expense)	$ (171)	$ 1,780	$ (1,417)