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NEW ACCOUNTING PRONOUNCEMENTS- Textuals (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Nov. 01, 2018
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2019
Jul. 31, 2018
Oct. 31, 2018
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   21.00%        
Accumulated deficit $ (303) $ (122)   $ (122)   $ (336)
Long-term Investments 75 99   99   $ 68
Impact of adoption of new guidance (7)     (7)    
Impact of Adopting New Revenue Guidance            
Accumulated deficit 23          
Long-term Investments 0          
Impact of Adopting New Tax Effects in AOCI Guidance            
Accumulated deficit 7          
Long-term Investments 0          
Impact of Adopting New Intra-Entity Tax Guidance            
Accumulated deficit (2)          
Long-term Investments 0          
Impact of Adopting New Investments Valuation Guidance            
Accumulated deficit 5          
Long-term Investments $ 7          
Impact of Adopting New Retirement Benefits Guidance            
Impact of adoption of new guidance   $ 2 $ 4 $ 7 $ 19