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Debt (Schedule of Balances Available for Borrowings)(Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Revolving Credit Facility [Member]
   
Debt Instrument [Line Items]    
Borrowings outstanding $ 0  
Letters of credit issued 0  
Available for borrowing 900  
Accounts Receivable Securitization Facility [Member]
   
Debt Instrument [Line Items]    
Borrowings outstanding 35 [1] 50 [1]
Letters of credit issued 79  
Available for borrowing $ 21  
[1] The weighted average interest rate was 0.7% as of September 30, 2014 and December 31, 2013.