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Restructuring of Operations - Accrued Restructuring Costs and Activity (Details)
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
Restructuring Reserve [Roll Forward]  
Beginning balance $ 26
Charges to restructuring 1
Cash payments (5)
Ending balance 22
Employee Termination Benefits [Member]  
Restructuring Reserve [Roll Forward]  
Beginning balance 21
Charges to restructuring
Cash payments (4)
Ending balance 17
Exit Costs [Member]  
Restructuring Reserve [Roll Forward]  
Beginning balance 5
Charges to restructuring 1
Cash payments (1)
Ending balance $ 5