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REVENUE CAPITALIZED CONTRACTUAL COST (Tables)
9 Months Ended
Jul. 31, 2020
Capitalized Contract Cost [Line Items]  
Capitalized Contract Cost [Abstract]
The following table provides a roll-forward of our capitalized contract costs, current and non-current:
 
Nine Months Ended
 
July 31, 2020
 
July 31, 2019
 
(in millions)
Beginning balance
$
28

 
$

Costs capitalized on November 1, 2018 due to ASC 606 adoption

 
29

Costs capitalized during the period
49

 
47

Costs amortized during the period
(50
)
 
(50
)
Ending balance
$
27

 
$
26