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Restructuring of Operations - Accrued Restructuring Costs and Activity (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Restructuring Reserve [Roll Forward]    
Beginning balance $ 16 $ 17
Charges to restructuring 17 24
Adjustments of accruals   (1)
Cash payments (3) (10)
Ending Balance 30 30
Employee Termination Benefits [Member]    
Restructuring Reserve [Roll Forward]    
Beginning balance 9 9
Charges to restructuring 16 21
Adjustments of accruals   (1)
Cash payments (2) (6)
Ending Balance 23 23
Exit Costs [Member]    
Restructuring Reserve [Roll Forward]    
Beginning balance 7 8
Charges to restructuring 1 3
Adjustments of accruals  
Cash payments (1) (4)
Ending Balance $ 7 $ 7