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Goodwill (Tables)
6 Months Ended
Apr. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Allocation and Changes in the Carrying Amount of Goodwill
The following table represents the carrying value of goodwill, by reportable segment as of October 31, 2020 and April 30, 2021:
 ComputeHPC & MCSStorageIntelligent EdgeFinancial ServicesCorporate Investments and OtherTotal
 In millions
Balance at October 31, 2020 and April 30, 2021 (1) (2)
$7,532 $3,616 $3,946 $2,566 $144 $213 $18,017 

(1)As a result of the organizational realignments which were effective as of November 1, 2020, (described in Note 1, "Overview and Summary of Significant Accounting Policies"), $213 million of goodwill was reallocated from Storage segment to Corporate Investments and Other segment as of the beginning of the period using a relative fair value approach.
(2)Goodwill is net of accumulated impairment losses of $953 million. Of this amount, $865 million related to the HPC & MCS reporting unit was recorded during the second quarter of 2020 and $88 million related to the CMS reporting unit within Corporate Investments and Other was recorded during the fourth quarter of fiscal 2018. There is no goodwill remaining in the CMS reporting unit.