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Restructuring of Operations - Accrued Restructuring Costs and Activity (Details)
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
Restructuring Reserve [Roll Forward]  
Beginning balance $ 17
Charges to restructuring 1
Cash payments (3)
Ending Balance 15
Employee Termination Benefits [Member]  
Restructuring Reserve [Roll Forward]  
Beginning balance $ 9
Charges to restructuring
Cash payments $ (1)
Ending Balance 8
Exit Costs [Member]  
Restructuring Reserve [Roll Forward]  
Beginning balance 8
Charges to restructuring 1
Cash payments (2)
Ending Balance $ 7