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Business Optimization Charges - Summary of Activity in Reserves Related to Restructuring Initiatives (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring Cost and Reserve [Line Items]
Charges	$ 17	$ 63	$ 94	$ 96
Severance and Other Employee Related Costs
Restructuring Cost and Reserve [Line Items]
Reserve, beginning balance			101
Charges			84
Payments			(13)
Reserve adjustments			(77)
Currency translation			(5)
Reserve, ending balance	$ 90		$ 90