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Fair Value Measurements Fair Values And Related Carrying Values of Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Accounts receivable, net $ 5,437 $ 5,793
Carrying Amount [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable, net 650 792
Debt, excluding capital lease obligations (10,988) (12,136)
Accounts payable (9,152) (8,406)
Residual value and credit guarantees (3) (8)
Contingent repurchase commitments (5) (7)
Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Accounts receivable, net 5,454 5,690
Notes receivable, net 710 836
Debt, excluding capital lease obligations (13,258) (14,099)
Accounts payable (9,148) (8,396)
Residual value and credit guarantees (2) (9)
Contingent repurchase commitments (7) (4)
Level 2 [Member] | Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Accounts receivable, net 5,454  
Notes receivable, net 710  
Debt, excluding capital lease obligations (13,189)  
Accounts payable (9,148)  
Level 3 [Member] | Fair Value [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt, excluding capital lease obligations (69)  
Residual value and credit guarantees (2)  
Contingent repurchase commitments $ (7)