Summary of Significant Accounting Policies - Product Warranty Liability (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Jan. 31, 2013		Jan. 31, 2012		Oct. 31, 2012
Product Liability Contingency [Line Items]
Product Warranty Accrual, Preexisting Increase Decrease Per Share, Net of Tax			$ 1.16
Warranty Recoveries	$ 27
Accrued Product Warranty And Deferred Warranty Revenue, Standard And Extended Warranty Programs, Roll Forward:
Accrued product warranty and deferred warranty revenue at beginning of period	1,118		598
Cost accrued and revenues deferred	111	[1]	111	[1]
Adjustments to pre-existing warranties	40	[2]	123	[2]
Payments and revenues recognized	(161)		(106)
Accrued product warranty and deferred warranty revenue at end of period	1,108		726
Less: Current portion	559		324
Noncurrent accrued product warranty and deferred warranty revenue	549		402
Product Warranty Accrual, Preexisting Increase Decrease Per Share, Net of Tax	$ 0.50		$ 1.76
Product Warranty Accrual, Preexisting Increase (Decrease), net of tax			81
Extended Warranty Programs [Member]
Extended Warranty Program:
Deferred Revenue	377				364
Revenue recognized under extended warranty programs	29		15
Product Warranty Accrual [Member]
Accrued Product Warranty And Deferred Warranty Revenue, Standard And Extended Warranty Programs, Roll Forward:
Adjustments to pre-existing warranties	40		123	[2]
Recoverable [Member]
Accrued Product Warranty And Deferred Warranty Revenue, Standard And Extended Warranty Programs, Roll Forward:
Adjustments to pre-existing warranties	$ 13

[1] Adjustments to pre-existing warranties reflect changes in our estimate of warranty costs for products sold in prior periods. Such adjustments typically occur when claims experience deviates from historic and expected trends. Our warranty liability is generally affected by component failure rates, repair costs, and the timing of failures. Future events and circumstances related to these factors could materially change our estimates and require adjustments to our liability. In addition, new product launches require a greater use of judgment in developing estimates until historical experience becomes available. In the first quarter of 2013, we recorded adjustments for changes in estimates of $40 million or $0.50 per diluted share. In the first quarter of 2012, we recorded adjustments for changes in estimates of $123 million, or $1.76 per diluted share. Net of tax, the first quarter of 2012 adjustments for changes in estimates amounted to $81 million, or $1.16 per diluted share.

[2] In the first quarter of 2013, we recognized $13 million of charges for adjustments to pre-existing warranties for a specific warranty issue related to component parts from a supplier. Also during the quarter, we reached agreement for reimbursement from this supplier for this amount and other costs previously accrued. As a result of this agreement, we recognized a recovery of $27 million within Costs of products sold and recorded a receivable within Other current assets.