Retirement and Post-Retirement Benefit Plans (Details 4) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2013
Change in benefit obligation:
Settlement	$ (168)
U.S. Defined Benefit Plans
Weighted average assumptions used to calculate net benefit (credit) cost
Discount rate (as a percent)	4.40%	4.90%	4.10%
Expected increase in compensation levels (as a percent)	2.00%	2.00%	2.00%
Expected long-term return on plan assets (as a percent)	7.20%	7.70%	7.80%
Increase in defined benefit plan benefit obligation		$ 870
Change in fair value of plan assets:
Fair value - beginning of year	$ 11,979	10,866
Acquisition/addition of plans	(1)
Actual return on plan assets	506	1,648
Employer contributions	29	27
Benefits paid	(322)	(558)
Settlement	(1,114)	(4)
Fair value - end of year	11,077	11,979	$ 10,866
Change in benefit obligation:
Projected benefit obligation - beginning of year	13,756	11,866
Acquisition/addition of plans	(1)
Service cost	1	1	1
Interest cost	566	569	560
Actuarial (gain) loss	(170)	1,882
Benefits paid	(322)	(558)
Settlement	(1,114)	(4)
Projected benefit obligation - end of year	12,716	13,756	$ 11,866
Funded status at end of year	(1,639)	(1,777)
Accumulated benefit obligation	$ 12,715	$ 13,755
Weighted average assumptions used to calculate the projected benefit obligations
Discount rate (as a percent)	4.40%	4.40%
Expected increase in compensation levels (as a percent)	2.00%	2.00%
Net amounts recognized for defined benefit and post-retirement benefit plans in Consolidated Balance Sheets
Current liabilities	$ (37)	$ (35)
Noncurrent liabilities	(1,602)	(1,742)
Funded status at end of year	(1,639)	(1,777)
Pretax net actuarial loss (gain) and prior service benefit recognized in accumulated other comprehensive loss for defined benefit and post-retirement benefit plans
Net actuarial loss (gain)	1,379
Total recognized in Accumulated other comprehensive loss	1,379
Net actuarial loss (gain) and prior service benefit that are expected to be amortized from accumulated other comprehensive loss (income) and recognized as components of net periodic benefit cost (credit)
Net actuarial (loss) gain	55
Total expected to be recognized in net periodic benefit (credit) cost	55
Defined benefit plans with projected benefit obligations exceeding the fair value of plan assets
Aggregate fair value of plan assets	11,077	11,979
Aggregate projected benefit obligation	12,716	13,756
Defined benefit plans with accumulated benefit obligations exceeding the fair value of plan assets
Aggregate fair value of plan assets	11,077	11,979
Aggregate accumulated benefit obligation	12,715	13,755
Contributions to benefit plans	$ 29	$ 27
Non-U.S. Defined Benefit Plans
Weighted average assumptions used to calculate net benefit (credit) cost
Discount rate (as a percent)	3.00%	3.90%	3.80%
Expected increase in compensation levels (as a percent)	2.40%	2.40%	2.40%
Expected long-term return on plan assets (as a percent)	6.90%	7.00%	7.20%
Change in fair value of plan assets:
Fair value - beginning of year	$ 17,570	$ 16,083
Acquisition/addition of plans	5	8
Actual return on plan assets	1,059	1,814
Employer contributions	619	1,019
Participant contributions	55	64
Benefits paid	(570)	(568)
Settlement	(17)	(49)
Currency impact	(1,244)	(801)
Fair value - end of year	17,477	17,570	$ 16,083
Change in benefit obligation:
Projected benefit obligation - beginning of year	21,220	19,152
Acquisition/addition of plans	1	10
Service cost	326	308	337
Interest cost	622	737	676
Participant contributions	55	64
Actuarial (gain) loss	457	2,500
Benefits paid	(570)	(568)
Plan amendments	(89)
Curtailment		(49)
Settlement	(17)	(49)
Special termination benefits	25	50	31
Currency impact	(1,509)	(935)
Projected benefit obligation - end of year	20,521	21,220	19,152
Funded status at end of year	(3,044)	(3,650)
Accumulated benefit obligation	$ 19,695	$ 20,207
Weighted average assumptions used to calculate the projected benefit obligations
Discount rate (as a percent)	3.00%	3.20%
Expected increase in compensation levels (as a percent)	2.50%	2.50%
Net amounts recognized for defined benefit and post-retirement benefit plans in Consolidated Balance Sheets
Noncurrent assets	$ 532	$ 421
Current liabilities	(42)	(43)
Noncurrent liabilities	(3,534)	(4,028)
Funded status at end of year	(3,044)	(3,650)
Pretax net actuarial loss (gain) and prior service benefit recognized in accumulated other comprehensive loss for defined benefit and post-retirement benefit plans
Net actuarial loss (gain)	5,161
Prior service benefit	(242)
Total recognized in Accumulated other comprehensive loss	4,919
Net actuarial loss (gain) and prior service benefit that are expected to be amortized from accumulated other comprehensive loss (income) and recognized as components of net periodic benefit cost (credit)
Net actuarial (loss) gain	25
Prior service benefit	(3)
Total expected to be recognized in net periodic benefit (credit) cost	22
Defined benefit plans with projected benefit obligations exceeding the fair value of plan assets
Aggregate fair value of plan assets	8,928	12,701
Aggregate projected benefit obligation	12,504	16,774
Defined benefit plans with accumulated benefit obligations exceeding the fair value of plan assets
Aggregate fair value of plan assets	8,858	12,578
Aggregate accumulated benefit obligation	11,804	15,797
Special termination benefits	25	50	31
Contributions to benefit plans	$ 619	1,019
Curtailment gain		$ (7)	$ (3)
Post-Retirement Benefit Plans
Weighted average assumptions used to calculate net benefit (credit) cost
Discount rate (as a percent)	3.60%	3.90%	3.00%
Expected long-term return on plan assets (as a percent)	9.00%	8.90%	9.00%
Change in fair value of plan assets:
Fair value - beginning of year	$ 458	$ 396
Actual return on plan assets	45	83
Employer contributions	39	92
Participant contributions	57	54
Benefits paid	(126)	(167)
Fair value - end of year	474	458	$ 396
Change in benefit obligation:
Projected benefit obligation - beginning of year	840	867
Service cost	5	5	6
Interest cost	29	32	31
Participant contributions	57	54
Actuarial (gain) loss	(59)	22
Benefits paid	(126)	(167)
Special termination benefits	1	32	(5)
Currency impact	(10)	(5)
Projected benefit obligation - end of year	737	840	867
Funded status at end of year	$ (263)	$ (382)
Weighted average assumptions used to calculate the projected benefit obligations
Discount rate (as a percent)	3.80%	3.60%
Net amounts recognized for defined benefit and post-retirement benefit plans in Consolidated Balance Sheets
Current liabilities	$ (46)	$ (47)
Noncurrent liabilities	(217)	(335)
Funded status at end of year	(263)	(382)
Pretax net actuarial loss (gain) and prior service benefit recognized in accumulated other comprehensive loss for defined benefit and post-retirement benefit plans
Net actuarial loss (gain)	(173)
Prior service benefit	(99)
Total recognized in Accumulated other comprehensive loss	(272)
Net actuarial loss (gain) and prior service benefit that are expected to be amortized from accumulated other comprehensive loss (income) and recognized as components of net periodic benefit cost (credit)
Net actuarial (loss) gain	(12)
Prior service benefit	(17)
Total expected to be recognized in net periodic benefit (credit) cost	(29)
Defined benefit plans with accumulated benefit obligations exceeding the fair value of plan assets
Special termination benefits	1	32	(5)
Contributions to benefit plans	$ 39	$ 92
Curtailment gain			$ (7)