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Debt Short Term and Long Term Debt (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Short Term and Long Term Debt [Line Items]    
Line of Credit Facility, Amount Outstanding $ 17,548 $ 9,378
Secured Debt 17,548 9,378
Securitized Debt Obligation Liability 5,238 1,500
Unsecured Debt 5,238 1,500
Revolving Credit Facility [Member]
    
Short Term and Long Term Debt [Line Items]    
Line of Credit Facility, Amount Outstanding 5,452  
Unsecured Debt 1,238  
Term debt [Member]
    
Short Term and Long Term Debt [Line Items]    
Securitized Debt Obligation Liability 12,096  
Senior Notes [Member]
    
Short Term and Long Term Debt [Line Items]    
Senior Notes 4,000  
North America [Member]
    
Short Term and Long Term Debt [Line Items]    
Secured Debt 11,142 9,378
Unsecured Debt 4,000 1,500
North America [Member] | Revolving Credit Facility [Member]
    
Short Term and Long Term Debt [Line Items]    
Line of Credit Facility, Amount Outstanding 1,095 354
North America [Member] | Term debt [Member]
    
Short Term and Long Term Debt [Line Items]    
Securitized Debt Obligation Liability 10,047 9,024
North America [Member] | Senior Notes [Member]
    
Short Term and Long Term Debt [Line Items]    
Unsecured Debt 4,000  
Senior Notes 4,000 1,500
International [Member]
    
Short Term and Long Term Debt [Line Items]    
Secured Debt 6,406  
Unsecured Debt 1,238  
International [Member] | Revolving Credit Facility [Member]
    
Short Term and Long Term Debt [Line Items]    
Line of Credit Facility, Amount Outstanding 4,357  
Unsecured Debt 1,238  
International [Member] | Term debt [Member]
    
Short Term and Long Term Debt [Line Items]    
Securitized Debt Obligation Liability $ 2,049