Retirement and Post-Retirement Benefit Plans (Details 6) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Post-Retirement Benefit Plans
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	$ 50	$ 47
Actual return on plan assets:
Fair value—end of year(3)	52	50
Future Contributions and Funding Policy
Employer contributions	6	4
Expected contribution to defined benefit plans in fiscal 2018	6
Future benefits payable for the retirement and post-retirement plans
2019	9
2020	10
2021	10
2022	10
2023	11
Next five fiscal years to October 31, 2028	59
Post-Retirement Benefit Plans | Discontinued Operations
Future Contributions and Funding Policy
Employer contributions	6
Non-U.S. Plans | Defined Benefit Plans
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	12,610	11,989
Actual return on plan assets:
Fair value—end of year(3)	$ 12,167	$ 12,610
2018 Target Allocation	100.00%
Plan Assets	100.00%	100.00%
Future Contributions and Funding Policy
Employer contributions	$ 158	$ 266
Expected contribution to defined benefit plans in fiscal 2018	190
Future benefits payable for the retirement and post-retirement plans
2019	453
2020	427
2021	449
2022	469
2023	492
Next five fiscal years to October 31, 2028	2,704
Non-U.S. Plans | Defined Benefit Plans | Discontinued Operations
Future Contributions and Funding Policy
Employer contributions	200
Non-U.S. Plans | Defined Benefit Plans | Private Equity
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	40
Actual return on plan assets:
Fair value—end of year(3)	$ 42	$ 40
Plan Assets	18.70%	25.70%
Non-U.S. Plans | Defined Benefit Plans | Hybrids
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	$ 492
Actual return on plan assets:
Fair value—end of year(3)	1,346	$ 492
Non-U.S. Plans | Defined Benefit Plans | Hedge Funds
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	63
Actual return on plan assets:
Fair value—end of year(3)	45	63
Non-U.S. Plans | Defined Benefit Plans | Real Estate Funds
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	253
Actual return on plan assets:
Fair value—end of year(3)	$ 229	$ 253
Plan Assets	4.20%	3.30%
Non-U.S. Plans | Defined Benefit Plans | Insurance Group Annuities
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	$ 87
Actual return on plan assets:
Fair value—end of year(3)	97	$ 87
Non-U.S. Plans | Defined Benefit Plans | Other
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	166
Actual return on plan assets:
Fair value—end of year(3)	$ 290	$ 166
Non-U.S. Plans | Defined Benefit Plans | Public equity securities
Actual return on plan assets:
Plan Assets	28.70%	33.80%
Non-U.S. Plans | Defined Benefit Plans | Equity-related investments
Actual return on plan assets:
2018 Target Allocation	56.30%
Plan Assets	51.60%	62.80%
Non-U.S. Plans | Defined Benefit Plans | Debt securities
Actual return on plan assets:
2018 Target Allocation	41.90%
Plan Assets	44.90%	32.90%
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	$ 547
Actual return on plan assets:
Fair value—end of year(3)	$ 423	$ 547
2018 Target Allocation	1.80%
Plan Assets	3.50%	4.30%
Non-U.S. Plans | Level 3 | Defined Benefit Plans
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	$ 143	$ 129
Actual return on plan assets:
Relating to assets held at the reporting date	1	(24)
Relating to assets sold during the period	5	1
Purchases, sales, and settlements	99	28
Transfers in and/or out of Level 3	0	9
Fair value—end of year(3)	248	143
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	33	32
Actual return on plan assets:
Relating to assets held at the reporting date	6	0
Relating to assets sold during the period	5	1
Purchases, sales, and settlements	(4)	0
Transfers in and/or out of Level 3	0	0
Fair value—end of year(3)	40	33
Non-U.S. Plans | Level 3 | Defined Benefit Plans | Hybrids
Changes in fair value measurements of Level 3 investments
Fair value—beginning of year	0
Actual return on plan assets:
Relating to assets held at the reporting date	2
Relating to assets sold during the period	0
Purchases, sales, and settlements	130
Transfers in and/or out of Level 3	0
Fair value—end of year(3)	132	0
Non-U.S. Plans | Level 3 | Defined Benefit Plans | Hedge Funds
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(3)	0	0
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	57	26
Actual return on plan assets:
Relating to assets held at the reporting date	0	3
Relating to assets sold during the period	0	0
Purchases, sales, and settlements	(20)	0
Transfers in and/or out of Level 3	0	28
Fair value—end of year(3)	37	57
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	52	63
Actual return on plan assets:
Relating to assets held at the reporting date	(7)	(39)
Relating to assets sold during the period	0	0
Purchases, sales, and settlements	(7)	0
Transfers in and/or out of Level 3	0	28
Fair value—end of year(3)	38	52
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	8
Actual return on plan assets:
Relating to assets held at the reporting date	0	12
Relating to assets sold during the period	0	0
Purchases, sales, and settlements	0	28
Transfers in and/or out of Level 3	0	(47)
Fair value—end of year(3)	1	1
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(3)	0	$ 0
U.S. non-qualified plan participants | U.S. Plans
Future Contributions and Funding Policy
Expected contribution to defined benefit plans in fiscal 2018	$ 1