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Debt and Borrowing Arrangements (Details 1) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Financial Instruments Pledged as Collateral [Abstract]    
Restricted cash, cash equivalents and investments $ 535 $ 531
Accounts receivable 672 573
Mortgage loans held for sale 1,707 4,329
Net investment in fleet leases 3,526 3,492
Vehicle Management Asset-Backed Debt [Member] | Assets held as collateral [Member]
   
Financial Instruments Pledged as Collateral [Abstract]    
Restricted cash, cash equivalents and investments 262  
Accounts receivable 74  
Net investment in fleet leases 3,264  
Total 3,600  
Mortgage Asset-Backed Debt [Member] | Assets held as collateral [Member]
   
Financial Instruments Pledged as Collateral [Abstract]    
Restricted cash, cash equivalents and investments 9  
Accounts receivable 90  
Mortgage loans held for sale 1,390  
Total $ 1,489