Costs Associated with Exit and Restructuring - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Exit and restructuring charges incurred	$ 81	$ 65
Productivity Plan
Restructuring Cost and Reserve [Line Items]
Exit and restructuring charges incurred	12
Acquisition Plan
Restructuring Cost and Reserve [Line Items]
Exit and restructuring charges incurred	69
Restructuring charges	$ 4	$ 19
Scenario, Forecast | Acquisition Plan | Minimum
Restructuring Cost and Reserve [Line Items]
Expected remaining charges related to exit and restructuring			$ 8
Scenario, Forecast | Acquisition Plan | Maximum
Restructuring Cost and Reserve [Line Items]
Expected remaining charges related to exit and restructuring			$ 12