Retirement and Post-Retirement Benefit Plans (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2010
U.S. Defined Benefit Plans
Weighted average assumptions used to calculate net benefit cost
Discount rate (as a percent)	4.80%	5.60%	5.90%
Average increase in compensation levels (as a percent)	2.00%	2.00%	2.00%
Expected long-term return on assets (as a percent)	7.60%	8.00%	8.00%
Change in fair value of plan assets:
Fair value - beginning of year	$ 10,662	$ 9,427
Actual return on plan assets	1,411	1,389
Employer contributions	50	279
Benefits paid	(556)	(424)
Settlements	(31)	(9)
Fair value - end of year	11,536	10,662	9,427
Change in benefit obligation:
Projected benefit obligation - beginning of year	11,945	10,902
Service cost	1	1	1
Interest cost	566	594	578
Actuarial loss (gain)	1,479	881
Benefits paid	(556)	(424)
Settlement	(31)	(9)
Special termination benefits	833
Projected benefit obligation - end of year	14,237	11,945	10,902
Defined Benefit Plan expenses amortized from accumulated other comprehensive income and recognized as components of net periodic benefit cost
Net experience loss (gain)	78
Total to be recognized in accumulated other comprehensive loss	78
Weighted average assumptions used to calculate the benefit obligation
Discount rate (as a percent)	4.10%	4.80%
Average increase in compensation levels (as a percent)	2.00%	2.00%
Defined benefit plans with projected benefit obligations exceeding the fair value of plan assets
Aggregate fair value of plan assets	11,536	10,662
Aggregate projected benefit obligation	14,237	11,945
Plan assets less than benefit obligation	(2,701)	(1,283)
Defined benefit plans with accumulated benefit obligations exceeding the fair value of plan assets
Aggregate fair value of plan assets	11,536	10,662
Aggregate accumulated benefit obligation	14,236	11,943
Net amount recognized	(2,701)	(1,283)
Accumulated benefit obligation	14,236	11,943
Net amounts recognized of defined benefit and post-retirement benefit plans
Current liability	(33)	(32)
Non-current liability	(2,668)	(1,251)
Net amount recognized	(2,701)	(1,283)
Defined Benefit Plan expenses recognized in accumulated other comprehensive income
Net experience loss (gain)	1,828
Total recognized in accumulated other comprehensive loss (income)	1,828
Non-U.S. Defined Benefit Plans
Weighted average assumptions used to calculate net benefit cost
Discount rate (as a percent)	4.50%	4.40%	5.00%
Average increase in compensation levels (as a percent)	2.50%	2.50%	2.50%
Expected long-term return on assets (as a percent)	6.40%	6.80%	7.00%
Change in fair value of plan assets:
Fair value - beginning of year	13,180	12,760
Acquisition/addition of plans	8	51
Actual return on plan assets	1,327	20
Employer contributions	582	458
Participants' contributions	57	65
Benefits paid	(462)	(450)
Settlements	(193)	(49)
Currency impact	(478)	325
Fair value - end of year	14,021	13,180	12,760
Change in benefit obligation:
Projected benefit obligation - beginning of year	16,328	16,089
Acquisition/addition/(deletion) of plans	25	36
Service cost	294	343	319
Interest cost	690	694	657
Participants' contributions	57	65
Actuarial loss (gain)	2,143	(632)
Benefits paid	(462)	(450)
Plan amendments	(67)	(154)
Curtailment	5
Settlement	(395)	(50)
Special termination benefits	17	16	29
Currency impact	(538)	371
Projected benefit obligation - end of year	18,097	16,328	16,089
Defined Benefit Plan expenses amortized from accumulated other comprehensive income and recognized as components of net periodic benefit cost
Net experience loss (gain)	347
Prior service benefit	(28)
Total to be recognized in accumulated other comprehensive loss	319
Weighted average assumptions used to calculate the benefit obligation
Discount rate (as a percent)	3.80%	4.50%
Average increase in compensation levels (as a percent)	2.40%	2.50%
Defined benefit plans with projected benefit obligations exceeding the fair value of plan assets
Aggregate fair value of plan assets	10,283	9,851
Aggregate projected benefit obligation	14,618	13,418
Plan assets less than benefit obligation	(4,076)	(3,148)
Defined benefit plans with accumulated benefit obligations exceeding the fair value of plan assets
Aggregate fair value of plan assets	10,193	8,465
Aggregate accumulated benefit obligation	13,645	11,323
Net amount recognized	(4,076)	(3,148)
Accumulated benefit obligation	17,070	15,413
Net amounts recognized of defined benefit and post-retirement benefit plans
Non-current assets	260	418
Current liability	(39)	(43)
Non-current liability	(4,297)	(3,523)
Net amount recognized	(4,076)	(3,148)
Defined Benefit Plan expenses recognized in accumulated other comprehensive income
Net experience loss (gain)	5,061
Prior service benefit	(298)
Total recognized in accumulated other comprehensive loss (income)	4,763
Post-Retirement Benefit Plans
Weighted average assumptions used to calculate net benefit cost
Discount rate (as a percent)	4.40%	4.40%	5.40%
Expected long-term return on assets (as a percent)	10.00%	10.50%	9.50%
Change in fair value of plan assets:
Fair value - beginning of year	394	374
Actual return on plan assets	36	56
Employer contributions	31	24
Participants' contributions	59	55
Benefits paid	(125)	(115)
Fair value - end of year	395	394	374
Change in benefit obligation:
Projected benefit obligation - beginning of year	816	845
Acquisition/addition/(deletion) of plans		9
Service cost	7	9	12
Interest cost	35	35	47
Participants' contributions	59	55
Actuarial loss (gain)	34	(23)
Benefits paid	(125)	(115)
Curtailment	5
Special termination benefits	227
Currency impact	(2)	1
Projected benefit obligation - end of year	1,056	816	845
Defined Benefit Plan expenses amortized from accumulated other comprehensive income and recognized as components of net periodic benefit cost
Net experience loss (gain)	1
Prior service benefit	(67)
Total to be recognized in accumulated other comprehensive loss	(66)
Weighted average assumptions used to calculate the benefit obligation
Discount rate (as a percent)	3.00%	4.40%
Defined benefit plans with projected benefit obligations exceeding the fair value of plan assets
Plan assets less than benefit obligation	(661)	(422)
Defined benefit plans with accumulated benefit obligations exceeding the fair value of plan assets
Net amount recognized	(661)	(422)
Net amounts recognized of defined benefit and post-retirement benefit plans
Current liability	(124)	(30)
Non-current liability	(537)	(392)
Net amount recognized	(661)	(422)
Defined Benefit Plan expenses recognized in accumulated other comprehensive income
Net experience loss (gain)	(11)
Prior service benefit	(235)
Total recognized in accumulated other comprehensive loss (income)	$ (246)