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Business Segment Information Business Segment Information Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Segment Reporting Information [Line Items]          
Proceeds from Sale of Property, Plant, and Equipment     $ 23 $ 9  
Gain on disposition of assets $ 28 $ 8 28 $ 8  
Operating Segments [Member] | Non-strategic Business [Member]          
Segment Reporting Information [Line Items]          
Gain on disposition of assets 28        
Other Current Liabilities [Member]          
Segment Reporting Information [Line Items]          
Severance Costs     $ 17   $ 21
Severance Cost, Additional $ 11