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Financial Instruments - Fair Value of Long Term Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of long term debt $ 754 $ 759
Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of long term debt 360 301
Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of long term debt $ 32 $ 46