Summary of Significant Accounting Policies (Tables)

3 Months Ended

Jan. 31, 2018

Product Warranty Liability [Line Items]

Schedule of Product Warranty Liability [Table Text Block]

The following table presents accrued product warranty and deferred warranty revenue activity:

	Three Months Ended January 31,
(in millions)	2018			2017
Balance at beginning of period	$	629		$	818
Costs accrued and revenues deferred	29			45
Adjustments to pre-existing warranties(A)	(6		)	(17		)
Payments and revenues recognized	(79		)	(95		)
Balance at end of period	573			751
Less: Current portion	287			371
Noncurrent accrued product warranty and deferred warranty revenue	$	286		$	380

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(A) Adjustments to pre-existing warranties reflect changes in our estimate of warranty costs for products sold in prior fiscal 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.