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Debt (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Short-term Debt [Line Items]    
Outstanding Balance $ 5,021 $ 3,314
Short-term Debt [Member]
    
Short-term Debt [Line Items]    
Year-End Stated Rate on Debt 1.03% 1.46%
Fees to maintain the secured financing facility 12.5 1.4
Commercial Paper [Member]
    
Short-term Debt [Line Items]    
Outstanding Balance 200 0
Commercial Paper [Member] | Short-term Debt [Member]
    
Short-term Debt [Line Items]    
Year-End Stated Rate on Debt 0.19% 0.00%
Other Short Term Borrowings [Member]
    
Short-term Debt [Line Items]    
Outstanding Balance 4,821 3,314
Other Short Term Borrowings [Member] | Bank Overdrafts [Member]
    
Short-term Debt [Line Items]    
Outstanding Balance $ 489 $ 615
Other Short Term Borrowings [Member] | Short-term Debt [Member]
    
Short-term Debt [Line Items]    
Year-End Stated Rate on Debt 1.08% 1.46%