XML 147 R87.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
SUPPLEMENTAL CASH FLOW INFORMATION Reconciliation of cash and cash equivalents (Details) - USD ($)
$ in Millions
Oct. 31, 2019
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2016
Supplemental Cash Flow Elements [Abstract]        
Cash and Cash Equivalents, at Carrying Value $ 1,598 $ 913    
Restricted Cash and Cash Equivalents, Current 0 2    
Restricted Cash and Cash Equivalents, Noncurrent 2 2    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 1,600 $ 917 $ 820 $ 785