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Fair Value Measurements Fair Value, Assets Measured on Nonrecurring Basis Using Unobservable Inputs (Details) (Level 3 [Member], USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equipment under operating leases & Assets held for sale or release, Total Losses $ (31) $ (49)
Property Plant and Equipment, Total Losses (21)   
Acquired intangible assets, Total Losses    (1)
Total Losses (52) (50)
Fair Value Measurements Nonrecurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equipment under operating leases & Assets held for sale or re-lease, Fair Value 25 111
Property, Plant, and Equipment, Fair Value 19   
Acquired intangible assets, Fair Value    8
Total Fair Value $ 44 $ 119