Revenue - Performance Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	$ 7,503	$ 11,251
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-31
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected revenue	89
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-31
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected revenue	73
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-31
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected revenue	45
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-31
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected revenue	23
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-31
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected revenue	8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-31
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Expected revenue	7
Extended Warranty Programs [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	$ 102	$ 113