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Loss Per Share Attributable to Navistar International Corporation - Narrative (Details) (USD $)	3 Months Ended			1 Months Ended
	Jan. 31, 2015	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2009
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares of Warrants Unwound	1,939,376nav_SharesofWarrantsUnwound	6,523,319nav_SharesofWarrantsUnwound
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	17,000,000		31,000,000
Shares related to warrants	2,900,000nav_SharesRelatedToWarrants		11,300,000nav_SharesRelatedToWarrants
Three Point Zero Percent Senior Subordinated Convertible Notes [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares of Warrants Unwound	1,939,376	6,523,319
Class of Warrant or Right, Outstanding	2,900,000
Shares related to convertible notes			11,300,000
Three Point Zero Percent Senior Subordinated Convertible Notes [Member] \| Convertible Debt Securities [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt Instrument, Convertible, Conversion Ratio	19.891
Debt Instrument Convertible Conversion Ratio Basis	1,000
Option Indexed to Issuer's Equity, Strike Price				$ 50.27
Investment Warrants, Exercise Price	60.14
Four Point Five Zero Senior Subordinated Convertible Notes [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares related to convertible notes	3,400,000		3,400,000
Four Point Five Zero Senior Subordinated Convertible Notes [Member] \| Convertible Debt Securities [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt Instrument, Convertible, Conversion Ratio	17.1233
Debt Instrument Convertible Conversion Ratio Basis	1,000
Debt Instrument, Convertible, Conversion Price	58.40
Four Point Seven Five Senior Subordinated Convertible Notes [Member] [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt Instrument, Convertible, Conversion Ratio	18.4946
Option Indexed to Issuer's Equity, Strike Price	54.07
Shares related to convertible notes	7,600,000
Four Point Seven Five Senior Subordinated Convertible Notes [Member] [Member] \| Convertible Debt Securities [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt Instrument Convertible Conversion Ratio Basis	1,000