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Marketable Debt Securities (Detail) (Truck, Parts and Other, USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 1,178.4 $ 1,183.5
Unrealized Gains 5.2 9.6
Unrealized Losses 1.8 0.4
Fair Value 1,181.8 1,192.7 [1]
U.S. tax-exempt securities
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 206.7 217.2
Unrealized Gains 0.9 1.5
Unrealized Losses 0.5 0.1
Fair Value 207.1 218.6
U.S. corporate securities
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 65.6 59.8
Unrealized Gains 0.1 0.3
Fair Value 65.7 60.1
U.S. government and agency securities
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 0.6 0.8
Fair Value 0.6 0.8
Non-U.S. government securities
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 314.5 349.3
Unrealized Gains 2.8 5.8
Unrealized Losses 0.3 0.1
Fair Value 317.0 355.0
Non-U.S. corporate securities
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 492.3 447.5
Unrealized Gains 0.9 1.4
Unrealized Losses 1.0 0.2
Fair Value 492.2 448.7
Other debt securities
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 98.7 108.9
Unrealized Gains 0.5 0.6
Fair Value $ 99.2 $ 109.5
[1] The December 31, 2012 consolidated balance sheet has been derived from audited financial statements.