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Financial Services Borrowings (Detail) (Financial Services, USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
Interest rate 1.80% 2.30%
Commercial paper $ 3,325.0 $ 3,673.6
Medium-term bank loans 237.7 236.3
Commercial paper and bank loans 3,562.7 3,909.9
Term notes 4,167.4 2,595.5
Commercial Paper, Bank Loans, and Term Debt at Carrying Value, Total 7,730.1 6,505.4
Commercial Papers
   
Debt Instrument [Line Items]    
Interest rate 1.10% 1.30%
Term notes $ 7,492.4 $ 6,269.1
Medium-term Notes
   
Debt Instrument [Line Items]    
Interest rate 5.50% 6.90%
Term Loan
   
Debt Instrument [Line Items]    
Interest rate 2.10% 3.40%