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2018 Global Restructuring Program Restructuring Reserve [Roll Forward] (Details) - 2018 Global Restructuring Program
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
Restructuring Cost and Reserve  
Accrued expenses - January 1 $ 0
Cash payments (14)
Currency and other 3
Accrued expenses - March 31 407
Workforce reductions and other exit costs  
Restructuring Cost and Reserve  
Charges for workforce reductions and other exit costs $ 418