Retirement and Post-Retirement Benefit Plans (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2009
Weighted average assumptions used to calculate net benefit cost
Expected long-term return on assets (as a percent)	7.60%
Change in fair value of plan assets:
Fair value - beginning of year	$ 10,354
Fair value - end of year	11,607
U.S. Defined Benefit Plans
Weighted average assumptions used to calculate net benefit cost
Discount rate (as a percent)	5.60%	5.90%	8.00%
Average increase in compensation levels (as a percent)	2.00%	2.00%	2.00%
Expected long-term return on assets (as a percent)	8.00%	8.00%	7.50%
Change in fair value of plan assets:
Fair value - beginning of year	9,427	8,371
Actual return on plan assets	1,389	1,224
Employer contributions	279	290
Benefits paid	(424)	(440)
Settlements	(9)	(18)
Fair value - end of year	10,662	9,427	8,371
Change in benefit obligation:
Projected benefit obligation - beginning of year	10,902	10,034
Service cost	1	1	27
Interest cost	594	578	592
Actuarial loss (gain)	881	747
Benefits paid	(424)	(440)
Settlement	(9)	(18)
Projected benefit obligation - end of year	11,945	10,902	10,034
Defined Benefit Plan expenses amortized from accumulated other comprehensive income and recognized as components of net periodic benefit cost
Net experience loss	43
Total to be recognized in accumulated other comprehensive loss (income)	43
Weighted average assumptions used to calculate the benefit obligation
Discount rate (as a percent)	4.80%	5.60%
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	10,662	9,427
Aggregate projected benefit obligation	11,945	10,902
Plan assets less than benefit obligation	(1,283)	(1,475)
Defined benefit plans with accumulated benefit obligations exceeding the fair value of plan assets
Aggregate fair value of plan assets	10,662	9,427
Aggregate accumulated benefit obligation	11,943	10,900
Net amount recognized	(1,283)	(1,475)
Accumulated benefit obligation	11,943	10,900
Net amounts recognized of defined benefit and post-retirement benefit plans
Current liability	(32)	(30)
Non-current liability	(1,251)	(1,445)
Net amount recognized	(1,283)	(1,475)
Defined Benefit Plan expenses recognized in accumulated other comprehensive income
Net experience loss (gain)	1,020
Total recognized in accumulated other comprehensive loss (income)	1,020
Non-U.S. Defined Benefit Plans
Weighted average assumptions used to calculate net benefit cost
Discount rate (as a percent)	4.40%	5.00%	6.00%
Average increase in compensation levels (as a percent)	2.50%	2.50%	2.60%
Expected long-term return on assets (as a percent)	6.80%	7.00%	6.90%
Change in fair value of plan assets:
Fair value - beginning of year	12,760	11,325
Acquisition/addition/(deletion) of plans	51
Actual return on plan assets	20	1,430
Employer contributions	458	482
Participants' contributions	65	72
Benefits paid	(450)	(366)
Settlements	(49)	(73)
Currency impact	325	(110)
Fair value - end of year	13,180	12,760	11,325
Change in benefit obligation:
Projected benefit obligation - beginning of year	16,089	14,144
Acquisition/addition/(deletion) of plans	36	5
Service cost	343	319	312
Interest cost	694	658	619
Participants' contributions	65	72
Actuarial loss (gain)	(632)	1,514
Benefits paid	(450)	(366)
Plan amendments	154	(26)
Curtailment		(12)
Settlement	(50)	(73)
Special termination benefits	16	29	55
Currency impact	371	(175)
Projected benefit obligation - end of year	16,328	16,089	14,144
Defined Benefit Plan expenses amortized from accumulated other comprehensive income and recognized as components of net periodic benefit cost
Net experience loss	252
Prior service benefit	(25)
Total to be recognized in accumulated other comprehensive loss (income)	227
Weighted average assumptions used to calculate the benefit obligation
Discount rate (as a percent)	4.50%	4.40%
Average increase in compensation levels (as a percent)	2.50%	2.50%
Defined benefit plans with projected benefit obligations exceeding the fair value of plan assets
Aggregate fair value of plan assets	9,851	11,907
Aggregate projected benefit obligation	13,418	15,331
Plan assets less than benefit obligation	(3,148)	(3,329)
Defined benefit plans with accumulated benefit obligations exceeding the fair value of plan assets
Aggregate fair value of plan assets	8,465	10,529
Aggregate accumulated benefit obligation	11,323	13,140
Net amount recognized	(3,148)	(3,329)
Accumulated benefit obligation	15,413	15,204
Net amounts recognized of defined benefit and post-retirement benefit plans
Non-current assets	418	95
Current liability	(43)	(37)
Non-current liability	(3,523)	(3,387)
Net amount recognized	(3,148)	(3,329)
Defined Benefit Plan expenses recognized in accumulated other comprehensive income
Net experience loss (gain)	3,949
Prior service benefit	(268)
Total recognized in accumulated other comprehensive loss (income)	3,681
Post-Retirement Benefit Plans
Weighted average assumptions used to calculate net benefit cost
Discount rate (as a percent)	4.40%	5.40%	8.20%
Expected long-term return on assets (as a percent)	10.50%	9.50%	9.30%
Change in fair value of plan assets:
Fair value - beginning of year	374	352
Actual return on plan assets	56	56
Employer contributions	24	25
Participants' contributions	55	49
Benefits paid	(115)	(109)
Fair value - end of year	394	374	352
Change in benefit obligation:
Projected benefit obligation - beginning of year	845	992
Acquisition/addition/(deletion) of plans	9
Service cost	9	12	14
Interest cost	35	47	70
Participants' contributions	55	49
Actuarial loss (gain)	(23)	(120)
Benefits paid	(115)	(109)
Plan amendments		(28)
Currency impact	1	2
Projected benefit obligation - end of year	816	845	992
Defined Benefit Plan expenses amortized from accumulated other comprehensive income and recognized as components of net periodic benefit cost
Net experience loss	(4)
Prior service benefit	(87)
Total to be recognized in accumulated other comprehensive loss (income)	(91)
Weighted average assumptions used to calculate the benefit obligation
Discount rate (as a percent)	4.40%	4.40%
Defined benefit plans with projected benefit obligations exceeding the fair value of plan assets
Plan assets less than benefit obligation	(422)	(471)
Defined benefit plans with accumulated benefit obligations exceeding the fair value of plan assets
Net amount recognized	(422)	(471)
Net amounts recognized of defined benefit and post-retirement benefit plans
Current liability	(30)	(39)
Non-current liability	(392)	(432)
Net amount recognized	(422)	(471)
Defined Benefit Plan expenses recognized in accumulated other comprehensive income
Net experience loss (gain)	(48)
Prior service benefit	(349)
Total recognized in accumulated other comprehensive loss (income)	$ (397)