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Finance Receivables - Off-Balance Sheet Securitizations (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 0 Months Ended
Oct. 31, 2012
Jan. 31, 2012
Oct. 31, 2012
Variable Interest Entity, Primary Beneficiary [Domain]
Financial Services Operations [Member]
Wholesale Portfolio [Member]
Oct. 31, 2011
Variable Interest Entity, Primary Beneficiary [Domain]
Financial Services Operations [Member]
Wholesale Portfolio [Member]
Oct. 31, 2012
Variable Funding Notes [Member]
Variable Interest Entity, Primary Beneficiary [Domain]
Financial Services Operations [Member]
Wholesale Portfolio [Member]
Oct. 31, 2011
Variable Funding Notes [Member]
Variable Interest Entity, Primary Beneficiary [Domain]
Financial Services Operations [Member]
Wholesale Portfolio [Member]
Oct. 31, 2012
Investor Notes October 2012 [Member]
Variable Interest Entity, Primary Beneficiary [Domain]
Financial Services Operations [Member]
Wholesale Portfolio [Member]
Oct. 31, 2011
Investor Notes October 2012 [Member]
Variable Interest Entity, Primary Beneficiary [Domain]
Financial Services Operations [Member]
Wholesale Portfolio [Member]
Oct. 31, 2012
Investor Notes October 2016 [Member]
Variable Interest Entity, Primary Beneficiary [Domain]
Financial Services Operations [Member]
Wholesale Portfolio [Member]
Oct. 31, 2011
Investor Notes October 2016 [Member]
Variable Interest Entity, Primary Beneficiary [Domain]
Financial Services Operations [Member]
Wholesale Portfolio [Member]
Oct. 31, 2012
Investor Notes January 2012 [Member]
Variable Interest Entity, Primary Beneficiary [Domain]
Financial Services Operations [Member]
Wholesale Portfolio [Member]
Oct. 31, 2011
Investor Notes January 2012 [Member]
Variable Interest Entity, Primary Beneficiary [Domain]
Financial Services Operations [Member]
Wholesale Portfolio [Member]
Oct. 31, 2012
Trac Funding Facility [Member]
Oct. 31, 2011
Trac Funding Facility [Member]
Nov. 02, 2011
Navistar Financial Retail Receivables Corporation [Member]
Financial Services Operations [Member]
Oct. 31, 2012
Borrowings Secured By Operating and Finance Leases [Member]
Trac Funding Facility [Member]
Financial Services Operations [Member]
Mar. 31, 2012
Borrowings Secured By Operating and Finance Leases [Member]
Trac Funding Facility [Member]
Financial Services Operations [Member]
Debt Instrument, Unused Borrowing Capacity, Amount         $ 450 $ 170             $ 74 $ 9      
Proceeds from investor notes                             224    
Repayments of investor notes 350 250                              
Debt Instrument, Face Amount     974 1,100 750 500 0 350 224 0 0 250       125 100
Finance Receivables Retail Accounts Collateral For Borrowed Securities                         103 174      
Cash Collateral for Borrowed Securities                         $ 43 $ 33