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Restructuring Charges (Narrative) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
employee
Dec. 31, 2016
USD ($)
Restructuring Cost and Reserve [Line Items]          
Restructuring charges $ 0 $ 0 $ 0 $ 41  
Severance          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges       $ 22  
Number of positions eliminated | employee       201  
Restructuring reserve $ 4   $ 4   $ 17
Asset impairments          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges       $ 8  
Other          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges       $ 10