Summary of Significant Accounting Policies - Product Warranty Liability (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018	Jan. 31, 2019	Oct. 31, 2017
Product Liability Contingency [Line Items]
Extended Product Warranty Accrual				$ 14
Document Type	10-K
Product Warranty Accrual	$ 449	$ 510	$ 529		$ 629
Product Warranty Accrual, Warranties Issued	162	249	211
Product Warranty Accrual, Currency Translation, Increase (Decrease)			1
Accrued Product Warranty And Deferred Warranty Revenue, Standard And Extended Warranty Programs, Roll Forward:
Adjustments to pre-existing warranties(A)(B)	40	3	(9)
Extended Warranty Program:
Product Warranty Accrual, Payments	(263)	(283)	(303)
standard and extended product warranty other adjustments	0	12
Product Warranty Accrual, Current	209	233	255
Product Warranty Accrual, Noncurrent	240	277	274
North America Truck [Member]
Accrued Product Warranty And Deferred Warranty Revenue, Standard And Extended Warranty Programs, Roll Forward:
Product Warranty Expense		14	29
Field Campaign to address issues in products sold [Member] | North America Truck [Member]
Accrued Product Warranty And Deferred Warranty Revenue, Standard And Extended Warranty Programs, Roll Forward:
Product Warranty Expense	$ 23	27	10
Pre-existing Warranty [Member] | North America Truck [Member]
Accrued Product Warranty And Deferred Warranty Revenue, Standard And Extended Warranty Programs, Roll Forward:
Product Warranty Expense		$ 13	$ 33
Minimum
Product Liability Contingency [Line Items]
Product Warranty Coverage Period	1 year
Maximum
Product Liability Contingency [Line Items]
Product Warranty Coverage Period	5 years
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member]
Product Liability Contingency [Line Items]
Extended Product Warranty Accrual				$ 2