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Restructuring of Operations - Restructuring Charges and Related Payments and Adjustments (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Restructuring Reserve [Roll Forward]    
Beginning balance $ 25  
Charges to restructuring 9  
Discontinued operations charges   1
Cash payments (11)  
Ending Balance 23  
Employee Termination Benefits [Member]
   
Restructuring Reserve [Roll Forward]    
Beginning balance 14  
Charges to restructuring 7  
Cash payments (8)  
Ending Balance 13  
Exit Costs [Member]
   
Restructuring Reserve [Roll Forward]    
Beginning balance 11  
Charges to restructuring 2  
Cash payments (3)  
Ending Balance $ 10