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Organization and Basis of Presentation, Fair Value (Details) (USD $)
In Billions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Minimum
Mar. 31, 2014
Maximum
Mar. 31, 2014
Carrying value of debt
Dec. 31, 2013
Carrying value of debt
Mar. 31, 2014
Fair value of debt
Dec. 31, 2013
Fair value of debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions            
Percent of trade payables outstanding   1.00%        
Percent of trade receivables outstanding   1.00%        
Financial instruments, outstanding term 90 days          
Total debt     $ 1.2 $ 1.2 $ 1.2 $ 1.2