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Summary of Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Foreign Currency Transactions      
Gain (loss) on revaluation of foreign currency transactions and monetary assets and liabilities $ 1 $ (2) $ (2)
Cash and Cash Equivalents      
Outstanding checks that were reclassified from cash and cash equivalents to be included in accounts payable 70 72  
Accounts Receivable      
Advance cash payments received from third parties to mitigate credit risk 117 173  
Standby letters of credit 426 343  
Net accounts receivable, maximum age of balances past their scheduled invoice date 30 days 30 days  
Allowance for doubtful accounts receivable $ 5 $ 4