Postretirement Benefits - Narrative (Details) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended	12 Months Ended			3 Months Ended	12 Months Ended	3 Months Ended	1 Months Ended
	Oct. 31, 2013	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2014	Oct. 31, 1993	Jul. 31, 2014	Feb. 29, 2012	May 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year		$ 148,000,000
Defined Benefit Plan, Accumulated Benefit Obligation	3,900,000,000	4,000,000,000	3,900,000,000		4,000,000,000
Restructuring charges		42,000,000	25,000,000	107,000,000
Defined benefit plan, weighted average rate of increase in in per capita cost percent of benefit obligation		8.25%
Defined Contribution Plan, Cost Recognized		27,000,000		41,000,000
Curtailments	4,000,000
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease)	33,000,000
Pension and other postretirment charges due to reduction in workfroce				7,000,000
Equity Method Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations		55.00%
Fixed Income Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations		30.00%
Other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations		10.00%
Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations		5.00%
US Large Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations		15.00%
United States Postretirement Benefit Plan of US Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Deferred Income Taxes and Other Assets, Noncurrent		537,000,000			537,000,000
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Employer contributions		164,000,000	165,000,000		164,000,000
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax		71,000,000	(585,000,000)	357,000,000
Curtailments		2,000,000	33,000,000
Plan participants' contributions		0	0
Benefits paid		318,000,000	333,000,000
Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Employer contributions		2,000,000	3,000,000
Defined benefit plan, weighted average rate of increase in in per capita cost percent of benefit obligation		91.00%
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year		7.80%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate		5.00%
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax		314,000,000	(200,000,000)	(88,000,000)
Curtailments		0	0
Plan participants' contributions		40,000,000	28,000,000
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year		2,000,000
Benefits paid		185,000,000	188,000,000
Defined benefit plan, benefits paid from Company assets		51,000,000	60,000,000
Unfunded pension plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefits paid			14,000,000
Other Pension Plan, Postretirement or Supplemental Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Contribution To The Trust Shares						25.5
Early Retiree Reinsurance Program [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan participants' contributions		0		3,000,000
Indianapolis and Waukesha Foundry [Member] | North America Truck [Member]
Defined Benefit Plan Disclosure [Line Items]
Restructuring charges					13,000,000
Indianapolis and Waukesha Foundry [Member] | North America Truck [Member] | Pension And Other Postretirement Contractual Termination Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Restructuring charges					11,000,000
Chatham [Member] | Facility Closing [Member] | Health and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Postemployment Benefits, Period Expense					14,000,000
Chatham [Member] | North America Truck [Member]
Defined Benefit Plan Disclosure [Line Items]
Restructuring charges							14,000,000
Effect Of Remeasurement On Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax		10,000,000
Call Option [Member]
Defined Benefit Plan Disclosure [Line Items]
Derivative, Notional Amount									$ 183,000,000
Designated as Hedging Instrument [Member] | Put Option [Member]
Defined Benefit Plan Disclosure [Line Items]
Derivative, Term of Contract								3 years