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Segment Reporting - Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Oct. 31, 2018
USD ($)
Jul. 31, 2018
USD ($)
Apr. 30, 2018
USD ($)
Jan. 31, 2018
USD ($)
Oct. 31, 2017
USD ($)
Jul. 31, 2017
USD ($)
Apr. 30, 2017
USD ($)
Jan. 31, 2017
USD ($)
Oct. 31, 2018
USD ($)
segments
Oct. 31, 2017
USD ($)
Oct. 31, 2016
USD ($)
Segment Reporting [Abstract]                      
Concentration Risk, Customer                 0 0 0
Segment Reporting Information [Line Items]                      
Number Of Segments | segments                 4    
Intersegment sales and revenues                 $ 0 $ 0 $ 1
Sales and revenues, net $ 3,317 $ 2,606 $ 2,422 $ 1,905 $ 2,598 $ 2,213 $ 2,096 $ 1,663 10,250 8,570 8,111
Financial Services Operations                      
Segment Reporting Information [Line Items]                      
Investment Income, Interest                 182 165 167
Intersegment sales and revenues                 97 93 100
Sales and revenues, net                 257 235 235
North America Truck [Member]                      
Segment Reporting Information [Line Items]                      
Intersegment sales and revenues                 104 39 132
Sales and revenues, net                 7,490 5,809 5,403
North America Parts [Member]                      
Segment Reporting Information [Line Items]                      
Intersegment sales and revenues                 8 23 29
Sales and revenues, net                 2,407 2,392 2,427
Corporate And Eliminations [Member]                      
Segment Reporting Information [Line Items]                      
Intersegment sales and revenues                 (264) (185) (305)
Sales and revenues, net                 $ (264) $ (175) $ (295)