Stock-Based Compensation - Summary of Restricted Stock Activity (Details) - Restricted Stock Awards - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2019
Shares
Outstanding at beginning of period (in shares)	42,325
Granted and assumed through acquisition (in shares)	28,403
Vested (in shares)	(20,605)
Forfeited/canceled (in shares)	(4,374)
Outstanding at end of period (in shares)	45,749	42,325
Weighted-Average Grant Date Fair Value Per Share
Outstanding at beginning of period (in dollars per share)	$ 13
Granted and assumed through acquisition (in dollars per share)	13
Vested (in dollars per share)	14
Forfeited/canceled (in dollars per share)	13
Outstanding at end of period (in dollars per share)	$ 13	$ 13
Total grant date fair value of restricted stock vested	$ 271	$ 254	$ 182
Unrecognized pre-tax stock-based compensation expense	$ 259
Remaining weighted-average vesting period over which pre-tax stock-based compensation expense is expected to be recognized	1 year 3 months 18 days

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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