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Restructuring of Operations - Accrued Restructuring Costs and Activity (Details)
$ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
Restructuring Reserve [Roll Forward]  
Beginning balance $ 38
Charges to restructuring 2
Cash payments (14)
Ending Balance 26
Employee Termination Benefits [Member]  
Restructuring Reserve [Roll Forward]  
Beginning balance 32
Charges to restructuring 0
Cash payments (12)
Ending Balance 20
Exit Costs [Member]  
Restructuring Reserve [Roll Forward]  
Beginning balance 6
Charges to restructuring 2
Cash payments (2)
Ending Balance $ 6