Retirement and Post-Retirement Benefit Plans - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Jan. 31, 2022	Oct. 31, 2021
Post-Retirement Benefit Plans
Retirement and post-retirement benefit plans
Anticipated contributions	$ 4
Non-U.S. \| Defined Benefit Plans
Retirement and post-retirement benefit plans
Anticipated contributions	44
Contributions to benefit plans	13
U.S. \| Non-qualified plan
Retirement and post-retirement benefit plans
Anticipated contributions	36
Contributions to benefit plans	$ 8
U.S. \| Defined Benefit Plans
Retirement and post-retirement benefit plans
Decrease in pension obligations		$ 5,200

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of contributions received and expected to be received by defined benefit plan from employer in current fiscal year.

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Amount of increase (decrease) in obligation for pension benefits. Includes, but is not limited to, defined benefit or defined contribution plans. Excludes other postretirement benefits.

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