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Financial Services Borrowings (Detail) - Financial Services - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Effective Rate 1.70% 1.40%
Commercial paper $ 2,723.7 $ 2,242.5
Bank loans 210.2 205.0
Commercial paper and bank loans 2,933.9 2,447.5
Term notes 5,945.5 6,027.7
Commercial Paper, Bank Loans, and Term Debt at Carrying Value, Total $ 8,879.4 $ 8,475.2
Commercial Paper    
Debt Instrument [Line Items]    
Effective Rate 1.30% 0.70%
Bank Loans    
Debt Instrument [Line Items]    
Effective Rate 6.90% 5.50%
Term Loan    
Debt Instrument [Line Items]    
Effective Rate 1.70% 1.50%