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2014 Organization Restructuring Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 18 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
After Tax      
Restructuring Cost and Reserve      
Restructuring Charges   $ 5  
2014 Organization Restructuring      
Restructuring Cost and Reserve      
Projected cash costs as a percentage of total charges 80.00%    
Cash payments $ 24 31  
2014 Organization Restructuring | After Tax      
Restructuring Cost and Reserve      
Restructuring Charges 10   $ 147
2014 Organization Restructuring | Before Tax      
Restructuring Cost and Reserve      
Restructuring Charges 14 $ 13 210
2014 Organization Restructuring | Minimum | After Tax      
Restructuring Cost and Reserve      
Expected restructuring charges 130   130
2014 Organization Restructuring | Minimum | Before Tax      
Restructuring Cost and Reserve      
Expected restructuring charges 190   190
2014 Organization Restructuring | Maximum | After Tax      
Restructuring Cost and Reserve      
Expected restructuring charges 160   160
2014 Organization Restructuring | Maximum | Before Tax      
Restructuring Cost and Reserve      
Expected restructuring charges $ 230   $ 230