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Business Optimization Charges - Summary of Activity in Reserves Related to Restructuring Initiatives (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]
Charges	$ 7	$ 52	$ 32	$ 77
Severance and Other Employee Related Costs
Restructuring Cost and Reserve [Line Items]
Reserve, beginning balance			92
Charges			29
Payments			(41)
Reserve adjustments			(5)
Currency translation			1
Reserve, ending balance	$ 76		$ 76