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Retirement and Post-Retirement Benefit Plans - Net Amounts Recognized for the Direct Plans in Combined and Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Oct. 31, 2021	Oct. 31, 2020
Defined Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Non-current assets	$ 1,898	$ 1,046
Current liabilities	(48)	(49)
Non-current liabilities	(1,368)	(1,715)
Funded status at end of year	482	(718)
Post-Retirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Non-current assets	0	0
Current liabilities	(7)	(6)
Non-current liabilities	(94)	(104)
Funded status at end of year	$ (101)	$ (110)

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- Definition

Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as current.

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent.

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