Summary of Significant Accounting Policies - Product Warranty Liability (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Oct. 31, 2013
Product Liability Contingency [Line Items]
Warranty Recoveries		$ 27
Accrued Product Warranty And Deferred Warranty Revenue, Standard And Extended Warranty Programs, Roll Forward:
Balance at beginning of period	1,349	1,118
Costs accrued and revenues deferred	71	111
Currency translation adjustment	(2)	0
Adjustments to pre-existing warranties(A)(B)	52	40
Payments and revenues recognized	(132)	(161)
Balance at end of period	1,338	1,108
Less: Current portion	602	559
Noncurrent accrued product warranty and deferred warranty revenue	736	549
Extended Warranty Programs [Member]
Extended Warranty Program:
Deferred Revenue	427		420
Deferred Revenue, Revenue Recognized	27	29
Product Warranty Accrual [Member]
Product Liability Contingency [Line Items]
Product Warranty Accrual, Preexisting Increase Decrease Per Share, Net of Tax	$ 0.64	$ 0.50
Accrued Product Warranty And Deferred Warranty Revenue, Standard And Extended Warranty Programs, Roll Forward:
Adjustments to pre-existing warranties(A)(B)	52	40
recoverable [Member]
Accrued Product Warranty And Deferred Warranty Revenue, Standard And Extended Warranty Programs, Roll Forward:
Adjustments to pre-existing warranties(A)(B)		$ 13