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Asset Impairment and Restructuring Severance Costs (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Restructuring Cost and Reserve [Line Items]        
Charges $ 7 $ 15 $ 21 $ 34
Employee Severance [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve     19 21
Charges     15 11
Payments     (21) (23)
Restructuring Reserve $ 13 $ 9 $ 13 $ 9