Summary of Significant Accounting Policies - Product Warranty Liability (Details) - USD ($) $ in Millions	6 Months Ended
Apr. 30, 2021	Apr. 30, 2020
Accrued Product Warranty And Deferred Warranty Revenue, Standard And Extended Warranty Programs, Roll Forward:
Balance at beginning of period	$ 449	$ 510
Costs accrued and revenues deferred	78	73
Adjustments to pre-existing warranties	80	17
Payments and revenues recognized	(135)	(132)
Balance at end of period	472	468
Less: Current portion	237	215
Noncurrent accrued product warranty and deferred warranty revenue	$ 235	$ 253

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and due after one year (or beyond the operating cycle if longer) for estimated claims under standard and extended warranty protection rights granted to customers.

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Amount of decrease in the standard and extended product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard and extended product warranty.

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Amount of increase (decrease) in the standard and extended product warranty accrual from changes in estimates attributable to preexisting product warranties.

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Amount of increase in the standard and extended product warranty accrual from warranties issued.

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