Retirement and Post-Retirement Benefit Plans (Details 6) - USD ($)	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Defined Benefit Plans
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	$ 12,167,000,000	$ 12,610,000,000
Actual return on plan assets:
Fair value—end of year	13,434,000,000	12,167,000,000
Future Contributions and Funding Policy
Employer contributions	166,000,000	158,000,000
Future benefits payable for the retirement and post-retirement plans
2020	471,000,000
2021	445,000,000
2022	467,000,000
2023	486,000,000
2024	503,000,000
Next five fiscal years to October 31, 2029	2,740,000,000
Post-Retirement Benefit Plans
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	52,000,000	50,000,000
Actual return on plan assets:
Fair value—end of year	54,000,000	52,000,000
Future Contributions and Funding Policy
Employer contributions	5,000,000	6,000,000
Expected contribution to defined benefit plans in fiscal 2019	6,000,000
Future benefits payable for the retirement and post-retirement plans
2020	10,000,000
2021	10,000,000
2022	10,000,000
2023	10,000,000
2024	11,000,000
Next five fiscal years to October 31, 2029	58,000,000
Post-Retirement Benefit Plans | Discontinued Operations
Future Contributions and Funding Policy
Employer contributions	$ 5,000,000
Post-Retirement Benefit Plans | Cash and cash equivalents
Actual return on plan assets:
Target Allocation	100.00%
Non-U.S. Plans | Defined Benefit Plans
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	$ 12,167,000,000
Actual return on plan assets:
Fair value—end of year	$ 13,434,000,000	$ 12,167,000,000
Target Allocation	100.00%
Actual Allocation	100.00%	100.00%
Future Contributions and Funding Policy
Expected contribution to defined benefit plans in fiscal 2019	$ 182,000,000
Non-U.S. Plans | Defined Benefit Plans | Discontinued Operations
Future Contributions and Funding Policy
Employer contributions	166,000,000
Non-U.S. Plans | Defined Benefit Plans | Private Equity
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	42,000,000
Actual return on plan assets:
Fair value—end of year	$ 44,000,000	$ 42,000,000
Actual Allocation	20.30%	18.70%
Non-U.S. Plans | Defined Benefit Plans | Hybrids
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	$ 1,391,000,000
Actual return on plan assets:
Fair value—end of year	1,815,000,000	$ 1,391,000,000
Non-U.S. Plans | Defined Benefit Plans | Real Estate Funds
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	229,000,000
Actual return on plan assets:
Fair value—end of year	$ 250,000,000	$ 229,000,000
Actual Allocation	4.30%	4.20%
Non-U.S. Plans | Defined Benefit Plans | Insurance Group Annuities
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	$ 97,000,000
Actual return on plan assets:
Fair value—end of year	91,000,000	$ 97,000,000
Non-U.S. Plans | Defined Benefit Plans | Other
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	290,000,000
Actual return on plan assets:
Fair value—end of year	$ 333,000,000	$ 290,000,000
Non-U.S. Plans | Defined Benefit Plans | Public equity securities
Actual return on plan assets:
Actual Allocation	22.00%	28.70%
Non-U.S. Plans | Defined Benefit Plans | Equity-related investments
Actual return on plan assets:
Target Allocation	49.80%
Actual Allocation	46.60%	51.60%
Non-U.S. Plans | Defined Benefit Plans | Debt securities
Actual return on plan assets:
Target Allocation	48.90%
Actual Allocation	49.20%	44.90%
Non-U.S. Plans | Defined Benefit Plans | Cash and cash equivalents
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	$ 423,000,000
Actual return on plan assets:
Fair value—end of year	$ 562,000,000	$ 423,000,000
Target Allocation	1.30%
Actual Allocation	4.20%	3.50%
Non-U.S. Plans | Level 3 | Defined Benefit Plans
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	$ 248,000,000	$ 143,000,000
Actual return on plan assets:
Relating to assets held at the reporting date	72,000,000	1,000,000
Relating to assets sold during the period	0	5,000,000
Purchases, sales, and settlements	271,000,000	99,000,000
Transfers in and/or out of Level 3	0	0
Fair value—end of year	591,000,000	248,000,000
Non-U.S. Plans | Level 3 | Defined Benefit Plans | Private Equity
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	40,000,000	33,000,000
Actual return on plan assets:
Relating to assets held at the reporting date	1,000,000	6,000,000
Relating to assets sold during the period	0	5,000,000
Purchases, sales, and settlements	1,000,000	(4,000,000)
Transfers in and/or out of Level 3	0	0
Fair value—end of year	42,000,000	40,000,000
Non-U.S. Plans | Level 3 | Defined Benefit Plans | Hybrids
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	132,000,000	0
Actual return on plan assets:
Relating to assets held at the reporting date	69,000,000	2,000,000
Relating to assets sold during the period	0	0
Purchases, sales, and settlements	271,000,000	130,000,000
Transfers in and/or out of Level 3	0	0
Fair value—end of year	472,000,000	132,000,000
Non-U.S. Plans | Level 3 | Defined Benefit Plans | Real Estate Funds
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	37,000,000	57,000,000
Actual return on plan assets:
Relating to assets held at the reporting date	2,000,000	0
Relating to assets sold during the period	0	0
Purchases, sales, and settlements	0	(20,000,000)
Transfers in and/or out of Level 3	0	0
Fair value—end of year	39,000,000	37,000,000
Non-U.S. Plans | Level 3 | Defined Benefit Plans | Insurance Group Annuities
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	38,000,000	52,000,000
Actual return on plan assets:
Relating to assets held at the reporting date	0	(7,000,000)
Relating to assets sold during the period	0	0
Purchases, sales, and settlements	(1,000,000)	(7,000,000)
Transfers in and/or out of Level 3	0	0
Fair value—end of year	37,000,000	38,000,000
Non-U.S. Plans | Level 3 | Defined Benefit Plans | Other
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	1,000,000	1,000,000
Actual return on plan assets:
Relating to assets held at the reporting date	0	0
Relating to assets sold during the period	0	0
Purchases, sales, and settlements	0	0
Transfers in and/or out of Level 3	0	0
Fair value—end of year	1,000,000	1,000,000
Non-U.S. Plans | Level 3 | Defined Benefit Plans | Cash and cash equivalents
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	0
Actual return on plan assets:
Fair value—end of year	0	0
U.S. Plans | Defined Benefit Plans
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	0
Actual return on plan assets:
Fair value—end of year	0	$ 0
U.S. non-qualified plan participants | U.S. Plans
Future Contributions and Funding Policy
Expected contribution to defined benefit plans in fiscal 2019	$ 2,000,000