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REVENUE Capitalized contract costs (Tables)
12 Months Ended
Oct. 31, 2020
Revenue from Contract with Customer [Abstract]  
Capitalized Contract Cost [Table Text Block]
The following table provides a roll-forward of our capitalized contract costs, current and non-current:
 
Year Ended October 31,
 
2020
 
2019
 
(in millions)
Balance at beginning of period
$
28

 
$

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

 
29

Costs capitalized during the period
86

 
63

Costs amortized during the period
(83
)
 
(64
)
Balance at end of period
$
31

 
$
28