Selected Quarterly Financial Data (Unaudited) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended																		12 Months Ended
	Oct. 31, 2013		Jul. 31, 2013		Apr. 30, 2013		Jan. 31, 2013		Oct. 31, 2012		Jul. 31, 2012		Apr. 30, 2012		Jan. 31, 2012		Jul. 31, 2011	Apr. 30, 2011	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2011
Sales and revenues, net	$ 2,751		$ 2,861		$ 2,526		$ 2,637		$ 3,179		$ 3,246		$ 3,261		$ 3,009				$ 10,775	$ 12,695	$ 13,641
Manufacturing gross margin	147	[1],[2]	273	[1],[2]	124	[1],[2]	312	[1],[2]	89	[1],[2]	404	[1],[2]	318	[1],[2]	315	[1],[2]
Income (loss) from continuing operations, net of tax	(153)	[3]	(237)	[3]	(353)	[3]	(114)	[3]	(2,737)	[3]	80	[3]	(138)	[3]	(144)	[3]			(803)	(2,891)	1,852
Loss from discontinued operations, net of tax	(1)		(10)		(21)		(9)		(32)		4		(34)		(9)				(41)	(71)	(74)
Net income (loss)	(154)		(247)		(374)		(123)		(2,769)		84		(172)		(153)				(844)	(2,962)	1,778
Basic: Loss from Continuing Operations (in dollars per share)	$ (1.90)		$ (2.94)		$ (4.39)		$ (1.42)		$ (39.67)		$ 1.16		$ (2.01)		$ (2.06)				$ (10.66)	$ (42.53)	$ 24.68
Basic: Loss from Discontinued Operations (in dollars per share)	$ (0.01)		$ (0.12)		$ (0.26)		$ (0.11)		$ (0.46)		$ 0.06		$ (0.49)		$ (0.13)				$ (0.51)	$ (1.03)	$ (1.02)
Basic (in dollars per share)	$ (1.91)		$ (3.06)		$ (4.65)		$ (1.53)		$ (40.13)		$ 1.22		$ (2.50)		$ (2.19)				$ (11.17)	$ (43.56)	$ 23.66
Diluted: Loss from Continuing Operations (in dollars per share)	$ (1.90)		$ (2.94)		$ (4.39)		$ (1.42)		$ (39.67)		$ 1.16		$ (2.01)		$ (2.06)				$ (10.66)	$ (42.53)	$ 23.61
Diluted: Loss from Discontinued Operations (in dollars per share)	$ (0.01)		$ (0.12)		$ (0.26)		$ (0.11)		$ (0.46)		$ 0.06		$ (0.49)		$ (0.13)				$ (0.51)	$ (1.03)	$ (0.97)
Diluted (in dollars per share)	$ (1.91)		$ (3.06)		$ (4.65)		$ (1.53)		$ (40.13)		$ 1.22		$ (2.50)		$ (2.19)				$ (11.17)	$ (43.56)	$ 22.64
Weighted Average Number of Shares Outstanding, Basic	39.79		38.81		0		0		26.48		35.25		0		0				80,400,000.00	69,100,000.00	72,800,000.00
Weighted Average Number of Shares Outstanding, Diluted	31.88		25.56		0		0		18.17		20.21		0		0				80,400,000.00	69,100,000.00	76,100,000.00
Product Warranty Accrual, Preexisting, Increase (Decrease)	152		10				13		149								30	27	404	404	79
Product Warranty Accrual Adjustment related to costs incurred in prior periods									28
Adjustments to valuation allowances																			350	2,207	(1,499)
Income tax expense related to reversal of previous quarter income tax benefits									233
Goodwill impairment charge																			81	0	0
Income tax benefit (expense)																			171	(1,780)	1,417
Domestic Tax Authority [Member]
Adjustments to valuation allowances																				2,000
Income tax benefit (expense)																				(2,000)	1,500
Intraperiod Tax Allocation Rule [Member]
Income tax benefit (expense)																			$ (220)

[1] (B)We record adjustments to our product warranty accrual to reflect changes in our estimate of warranty costs for products sold in prior periods. Such adjustments typically occur when claims experience deviates from historic and expected trends. In the fourth quarter of 2013 and 2012, we recorded adjustments for changes in estimates of $152 million and $149 million, respectively. The warranty estimation for engines sold in 2012 includes a factor for improvements to the design and manufacturing process that was based on historical experience. In the fourth quarter of 2012, we identified a deviation from historic experience and we recorded an adjustment for a change in estimate to increase the costs accrued for warranty of $28 million for products sold in the first three quarters of 2012.

[2] (A)Manufacturing gross margin is calculated by subtracting Costs of products sold from Sales of manufactured products, net.

[3] (C)In the fourth quarter of 2012, we determined that an additional valuation allowance on our U.S. deferred tax assets was required, due in part to our current domestic performance, which include continued fourth quarter deterioration and cumulative losses as of October 31, 2012 which included fourth quarter warranty charges. As a result we recognized income tax expense of $2 billion for the increase in the valuation allowance. In the fourth quarter of 2012, we also recognized $233 million of income tax expense related to the reversal of income tax benefits recognized in the first, second, and third quarters of 2012. In the fourth quarter of 2013, our North America Truck segment recorded a non-cash charge of $77 million to reflect impairment of goodwill as a result of changes in our organizational and reporting structures, which resulted in a change in certain of our reporting units. The impairment charges were included in Asset impairment charges.Also in the fourth quarter of 2013, the Company met the criteria necessary to apply the exception within the intraperiod tax allocation rules. As a result, the Company recorded an income tax benefit of $220 million, which was recorded in Income tax benefit (expense) related to continuing operations.