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Asset Impairment and Restructuring (Severance Costs) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Restructuring Reserve [Roll Forward]      
Charges $ 214 $ 39 $ 43
Employee Severance [Member]      
Restructuring Reserve [Roll Forward]      
Restructuring Reserve   21 0
Charges   27 29
Payments   (29) (8)
Restructuring Reserve $ 21 $ 19 $ 21