Retirement and Post-Retirement Benefit Plans (Details 4) (USD $)	12 Months Ended	6 Months Ended	12 Months Ended
	Oct. 31, 2014	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Weighted average assumptions used to calculate net benefit (credit) cost
Estimated life of plan participants	26 years 6 months
2012 EER
Change in benefit obligation:
Special termination benefits	(833,000,000)
Defined benefit plans with accumulated benefit obligations exceeding the fair value of plan assets
Combined age and service required for each employee participating in the restructuring plan	65 years
Number of employees who participated	8,500
Special termination benefits	833,000,000
Maximum period for continuing health care coverage at active employee contribution rates for participating employees in restructuring plan	24 months
Curtailment (gain) loss		(30,000,000)
U.S. Defined Benefit Plans
Weighted average assumptions used to calculate net benefit (credit) cost
Discount rate (as a percent)	4.90%		4.10%	4.80%
Expected increase in compensation levels (as a percent)	2.00%		2.00%	2.00%
Expected long-term return on plan assets (as a percent)	7.70%		7.80%	7.60%
Increase in defined benefit plan benefit obligation	870,000,000
Change in fair value of plan assets:
Fair value - beginning of year	10,866,000,000		11,536,000,000
Actual return on plan assets	1,648,000,000		629,000,000
Employer contributions	27,000,000		54,000,000
Benefits paid	(558,000,000)		(1,320,000,000)
Settlement	(4,000,000)		(33,000,000)
Fair value - end of year	11,979,000,000	11,536,000,000	10,866,000,000	11,536,000,000
Change in benefit obligation:
Projected benefit obligation - beginning of year	11,866,000,000		14,237,000,000
Service cost	1,000,000		1,000,000	1,000,000
Interest cost	569,000,000		560,000,000	566,000,000
Actuarial (gain) loss	1,882,000,000		(1,579,000,000)
Benefits paid	(558,000,000)		(1,320,000,000)
Settlement	(4,000,000)		(33,000,000)
Special termination benefits				833,000,000
Projected benefit obligation - end of year	13,756,000,000	14,237,000,000	11,866,000,000	14,237,000,000
Funded status at end of year	(1,777,000,000)		(1,000,000,000)
Accumulated benefit obligation	13,755,000,000		11,865,000,000
Weighted average assumptions used to calculate the projected benefit obligations
Discount rate (as a percent)	4.40%		4.90%
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	(35,000,000)		(33,000,000)
Noncurrent liabilities	(1,742,000,000)		(967,000,000)
Funded status at end of year	(1,777,000,000)		(1,000,000,000)
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)	1,405,000,000
Total recognized in accumulated other comprehensive loss (income)	1,405,000,000
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	54,000,000
Total expected to be recognized in net periodic benefit cost (credit)	54,000,000
Defined benefit plans with projected benefit obligations exceeding the fair value of plan assets
Aggregate fair value of plan assets	11,979,000,000		10,866,000,000
Aggregate projected benefit obligation	13,756,000,000		11,866,000,000
Defined benefit plans with accumulated benefit obligations exceeding the fair value of plan assets
Aggregate fair value of plan assets	11,979,000,000		10,866,000,000
Aggregate accumulated benefit obligation	13,755,000,000		11,865,000,000
Special termination benefits				(833,000,000)
Contributions to benefit plans	27,000,000		54,000,000
U.S. Defined Benefit Plans | 2012 EER | Minimum
Defined benefit plans with accumulated benefit obligations exceeding the fair value of plan assets
Period for calculation of lump sum payment	5 months
U.S. Defined Benefit Plans | 2012 EER | Maximum
Defined benefit plans with accumulated benefit obligations exceeding the fair value of plan assets
Period for calculation of lump sum payment	14 months
Non-U.S. Defined Benefit Plans
Weighted average assumptions used to calculate net benefit (credit) cost
Discount rate (as a percent)	3.90%		3.80%	4.50%
Expected increase in compensation levels (as a percent)	2.40%		2.40%	2.50%
Expected long-term return on plan assets (as a percent)	7.00%		7.20%	6.40%
Change in fair value of plan assets:
Fair value - beginning of year	16,083,000,000		14,021,000,000
Acquisition/addition of plans	8,000,000		7,000,000
Actual return on plan assets	1,814,000,000		1,842,000,000
Employer contributions	1,019,000,000		634,000,000
Participant contributions	64,000,000		63,000,000
Benefits paid	(568,000,000)		(504,000,000)
Settlement	(49,000,000)		(96,000,000)
Currency impact	(801,000,000)		116,000,000
Fair value - end of year	17,570,000,000	14,021,000,000	16,083,000,000	14,021,000,000
Change in benefit obligation:
Projected benefit obligation - beginning of year	19,152,000,000		18,097,000,000
Acquisition/addition of plans	10,000,000		14,000,000
Service cost	308,000,000		337,000,000	294,000,000
Interest cost	737,000,000		676,000,000	690,000,000
Participant contributions	64,000,000		63,000,000
Actuarial (gain) loss	2,500,000,000		343,000,000
Benefits paid	(568,000,000)		(504,000,000)
Plan amendments			6,000,000
Curtailment	(49,000,000)		13,000,000
Settlement	(49,000,000)		(100,000,000)
Special termination benefits	50,000,000		31,000,000	17,000,000
Currency impact	(935,000,000)		176,000,000
Projected benefit obligation - end of year	21,220,000,000	18,097,000,000	19,152,000,000	18,097,000,000
Funded status at end of year	(3,650,000,000)		(3,069,000,000)
Accumulated benefit obligation	20,207,000,000		18,254,000,000
Weighted average assumptions used to calculate the projected benefit obligations
Discount rate (as a percent)	3.20%		3.90%
Expected increase in compensation levels (as a percent)	2.50%		2.40%
Net amounts recognized for defined benefit and post-retirement benefit plans in Consolidated Balance Sheets
Noncurrent assets	421,000,000		479,000,000
Current liabilities	(43,000,000)		(46,000,000)
Noncurrent liabilities	(4,028,000,000)		(3,502,000,000)
Funded status at end of year	(3,650,000,000)		(3,069,000,000)
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)	5,423,000,000
Prior service benefit	(186,000,000)
Total recognized in accumulated other comprehensive loss (income)	5,237,000,000
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	452,000,000
Prior service benefit	(22,000,000)
Total expected to be recognized in net periodic benefit cost (credit)	430,000,000
Defined benefit plans with projected benefit obligations exceeding the fair value of plan assets
Aggregate fair value of plan assets	12,701,000,000		10,462,000,000
Aggregate projected benefit obligation	16,774,000,000		14,010,000,000
Defined benefit plans with accumulated benefit obligations exceeding the fair value of plan assets
Aggregate fair value of plan assets	12,578,000,000		9,926,000,000
Aggregate accumulated benefit obligation	15,797,000,000		12,703,000,000
Special termination benefits	(50,000,000)		(31,000,000)	(17,000,000)
Contributions to benefit plans	1,019,000,000		634,000,000
Curtailment (gain) loss	(7,000,000)		(3,000,000)	4,000,000
Retirement Medical Savings Account | 2012 EER
Change in benefit obligation:
Special termination benefits		(227,000,000)
Defined benefit plans with accumulated benefit obligations exceeding the fair value of plan assets
Special termination benefits		227,000,000
Curtailment (gain) loss		(37,000,000)
Retirement Medical Savings Account | 2012 EER | Maximum
Change in fair value of plan assets:
Employer contributions		12,000
Defined benefit plans with accumulated benefit obligations exceeding the fair value of plan assets
Contributions to benefit plans		12,000
Post-Retirement Benefit Plans
Weighted average assumptions used to calculate net benefit (credit) cost
Discount rate (as a percent)	3.90%		3.00%	4.40%
Expected long-term return on plan assets (as a percent)	8.90%		9.00%	10.00%
Change in fair value of plan assets:
Fair value - beginning of year	396,000,000		395,000,000
Actual return on plan assets	83,000,000		32,000,000
Employer contributions	92,000,000		102,000,000
Participant contributions	54,000,000		72,000,000
Benefits paid	(167,000,000)		(205,000,000)
Fair value - end of year	458,000,000	395,000,000	396,000,000	395,000,000
Change in benefit obligation:
Projected benefit obligation - beginning of year	867,000,000		1,056,000,000
Service cost	5,000,000		6,000,000	7,000,000
Interest cost	32,000,000		31,000,000	35,000,000
Participant contributions	54,000,000		72,000,000
Actuarial (gain) loss	22,000,000		(85,000,000)
Benefits paid	(167,000,000)		(205,000,000)
Special termination benefits	32,000,000		(5,000,000)	227,000,000
Currency impact	(5,000,000)		(3,000,000)
Projected benefit obligation - end of year	840,000,000	1,056,000,000	867,000,000	1,056,000,000
Funded status at end of year	(382,000,000)		(471,000,000)
Weighted average assumptions used to calculate the projected benefit obligations
Discount rate (as a percent)	3.60%		3.90%
Net amounts recognized for defined benefit and post-retirement benefit plans in Consolidated Balance Sheets
Current liabilities	(47,000,000)		(109,000,000)
Noncurrent liabilities	(335,000,000)		(362,000,000)
Funded status at end of year	(382,000,000)		(471,000,000)
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)	(115,000,000)
Prior service benefit	(119,000,000)
Total recognized in accumulated other comprehensive loss (income)	(234,000,000)
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	(10,000,000)
Prior service benefit	(20,000,000)
Total expected to be recognized in net periodic benefit cost (credit)	(30,000,000)
Defined benefit plans with accumulated benefit obligations exceeding the fair value of plan assets
Special termination benefits	(32,000,000)		5,000,000	(227,000,000)
Contributions to benefit plans	92,000,000		102,000,000
Curtailment (gain) loss			$ (7,000,000)	$ (30,000,000)