Retirement and Post-Retirement Benefit Plans (Details 4) - USD ($)	3 Months Ended				12 Months Ended
	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Change in benefit obligation:
Settlement	$ 26,000,000	$ 22,000,000	$ 12,000,000	$ 4,000,000	$ 0	$ 64,000,000	$ 0
Defined Benefit Plans | U.S. Plans
Change in fair value of plan assets:
Fair value—beginning of year					0
Fair value—end of year(3)	0				0	0
Change in benefit obligation:
Projected benefit obligation—beginning of year					5,000,000
Projected benefit obligation—end of year(3)	5,000,000				5,000,000	5,000,000
Defined Benefit Plans | U.S. Plans | Discontinued Operations, Disposed of by Means Other than Sale [Member] | Everett Transaction
Change in fair value of plan assets:
Transfer to Everett/Seattle plans					(702,000,000)
Change in benefit obligation:
Decrease from transfer					503,000,000
Defined Benefit Plans | U.S. Plans | Discontinued Operations, Disposed of by Means Other than Sale [Member] | Seattle Transaction
Change in fair value of plan assets:
Transfer to Everett/Seattle plans					(97,000,000)
Change in benefit obligation:
Decrease from transfer					165,000,000
Defined Benefit Plans | Non-U.S. Plans
Change in fair value of plan assets:
Fair value—beginning of year				11,989,000,000	12,610,000,000	11,989,000,000
Transfer to Everett/Seattle plans					6,000,000	(799,000,000)
Addition/deletion of plans(2)					181,000,000	5,000,000
Actual return on plan assets					93,000,000	941,000,000
Employer contributions					158,000,000	266,000,000
Participant contributions					25,000,000	17,000,000
Benefits paid					(450,000,000)	(408,000,000)
Settlement					(104,000,000)	(60,000,000)
Currency impact					(352,000,000)	659,000,000
Fair value—end of year(3)	12,610,000,000				12,167,000,000	12,610,000,000	11,989,000,000
Change in benefit obligation:
Projected benefit obligation—beginning of year				13,555,000,000	13,069,000,000	13,555,000,000
Transfer from Parent					5,000,000	(668,000,000)
Addition/deletion of plans(2)					181,000,000	19,000,000
Service cost					105,000,000	139,000,000	199,000,000
Interest cost					225,000,000	213,000,000	317,000,000
Participant contributions					25,000,000	17,000,000
Actuarial (gain) loss					(40,000,000)	(445,000,000)
Benefits paid					(450,000,000)	(408,000,000)
Plan amendments					22,000,000	(1,000,000)
Curtailment					(4,000,000)	(1,000,000)
Settlement					(104,000,000)	(60,000,000)
Special termination benefits					6,000,000	5,000,000
Currency impact					(372,000,000)	704,000,000
Projected benefit obligation—end of year(3)	13,069,000,000				12,668,000,000	13,069,000,000	13,555,000,000
Funded status at end of year	(459,000,000)				(501,000,000)	(459,000,000)
Accumulated benefit obligation	$ 12,832,000,000				$ 12,446,000,000	$ 12,832,000,000
Weighted average assumptions used to calculate the projected benefit obligations for Direct plans:
Discount rate	2.00%				2.10%	2.00%
Expected increase in compensation levels	2.30%				2.50%	2.30%
Net amounts recognized for the Direct plans in Combined and Consolidated Balance Sheets:
Non-current assets	$ 830,000,000				$ 829,000,000	$ 830,000,000
Current liabilities	(39,000,000)				(40,000,000)	(39,000,000)
Non-current liabilities	(1,250,000,000)				(1,290,000,000)	(1,250,000,000)
Funded status at end of year	(459,000,000)				(501,000,000)	(459,000,000)
Pretax net actuarial loss (gain) and prior service benefit recognized in accumulated other comprehensive loss for and prior service benefit recognized in Accumulated other comprehensive loss for the Direct defined benefit plans:
Net actuarial loss (gain)					2,938,000,000
Prior service benefit					(65,000,000)
Total recognized in accumulated other comprehensive loss					2,873,000,000
Net actuarial loss and prior service benefit for Direct plans that are expected to be amortized from Accumulated other comprehensive loss and recognized as components of net periodic benefit cost (credit):
Net actuarial loss (gain)					228,000,000
Prior service benefit					(15,000,000)
Total expected to be recognized in net periodic benefit cost (credit)					213,000,000
Direct defined benefit plans with projected benefit obligations exceeding the fair value of plan assets:
Aggregate fair value of plan assets	2,596,000,000				2,314,000,000	2,596,000,000
Aggregate projected benefit obligation	3,884,000,000				3,644,000,000	3,884,000,000
Direct defined benefit plans with accumulated benefit obligations exceeding the fair value of plan assets:
Aggregate fair value of plan assets	1,272,000,000				2,291,000,000	1,272,000,000
Aggregate accumulated benefit obligation	2,476,000,000				3,495,000,000	2,476,000,000
Post-Retirement Benefit Plans
Change in fair value of plan assets:
Fair value—beginning of year				47,000,000	50,000,000	47,000,000
Transfer to Everett/Seattle plans					0	0
Addition/deletion of plans(2)					0	0
Actual return on plan assets					1,000,000	1,000,000
Employer contributions					6,000,000	4,000,000
Participant contributions					4,000,000	4,000,000
Benefits paid					(9,000,000)	(6,000,000)
Settlement					0	0
Currency impact					0	0
Fair value—end of year(3)	50,000,000				52,000,000	50,000,000	47,000,000
Change in benefit obligation:
Projected benefit obligation—beginning of year				$ 158,000,000	170,000,000	158,000,000
Transfer from Parent					0	0
Addition/deletion of plans(2)					0	0
Service cost					1,000,000	3,000,000	3,000,000
Interest cost					7,000,000	6,000,000	6,000,000
Participant contributions					4,000,000	4,000,000
Actuarial (gain) loss					(9,000,000)	4,000,000
Benefits paid					(9,000,000)	(6,000,000)
Plan amendments					0	0
Curtailment					0	0
Settlement					0	0
Special termination benefits					0	0
Currency impact					(4,000,000)	1,000,000
Projected benefit obligation—end of year(3)	170,000,000				160,000,000	170,000,000	$ 158,000,000
Funded status at end of year	(120,000,000)				(108,000,000)	(120,000,000)
Accumulated benefit obligation	$ 0				$ 0	$ 0
Weighted average assumptions used to calculate the projected benefit obligations for Direct plans:
Discount rate	4.50%				4.90%	4.50%
Expected increase in compensation levels	0.00%				0.00%	0.00%
Net amounts recognized for the Direct plans in Combined and Consolidated Balance Sheets:
Non-current assets	$ 0				$ 0	$ 0
Current liabilities	(4,000,000)				(6,000,000)	(4,000,000)
Non-current liabilities	(116,000,000)				(102,000,000)	(116,000,000)
Funded status at end of year	$ (120,000,000)				(108,000,000)	$ (120,000,000)
Pretax net actuarial loss (gain) and prior service benefit recognized in accumulated other comprehensive loss for and prior service benefit recognized in Accumulated other comprehensive loss for the Direct defined benefit plans:
Net actuarial loss (gain)					(11,000,000)
Prior service benefit					0
Total recognized in accumulated other comprehensive loss					(11,000,000)
Net actuarial loss and prior service benefit for Direct plans that are expected to be amortized from Accumulated other comprehensive loss and recognized as components of net periodic benefit cost (credit):
Net actuarial loss (gain)					(4,000,000)
Prior service benefit					0
Total expected to be recognized in net periodic benefit cost (credit)					$ (4,000,000)