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NORTHERN CALIFORNIA WILDFIRES IMPACT (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended 18 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2019
Apr. 30, 2018
Oct. 31, 2018
Apr. 30, 2019
Unusual or Infrequent Item, or Both [Line Items]            
Loss from Catastrophes $ 0 $ 0 $ 0 $ 7    
Insurance Recoveries   $ 32   63    
Northern California Wildfires [Member]            
Unusual or Infrequent Item, or Both [Line Items]            
Insurance Recoveries     22 40 $ 68 $ 90
Property, Plant and Equipment [Member] | Northern California Wildfires [Member]            
Unusual or Infrequent Item, or Both [Line Items]            
Property, Plant and Equipment purchases     7 $ 9 $ 27 34
Uninsured Risk [Member]            
Unusual or Infrequent Item, or Both [Line Items]            
Loss from Catastrophes     10      
Minimum | Northern California Wildfires [Member]            
Unusual or Infrequent Item, or Both [Line Items]            
Insurance Settlements Receivable, Current 30   30     30
Maximum | Northern California Wildfires [Member]            
Unusual or Infrequent Item, or Both [Line Items]            
Insurance Settlements Receivable, Current $ 40   $ 40     $ 40