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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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]
Charges	$ 26	$ 17	$ 58	$ 94
Severance and Other Employee Related Costs
Restructuring Cost and Reserve [Line Items]
Reserve, beginning balance			92
Charges			53
Payments			(63)
Reserve adjustments			(5)
Currency translation			4
Reserve, ending balance	$ 81		$ 81