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Restructuring and Impairment Charges - Employee-related severance (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring accrual
Balance in severance accrual at beginning of period
Restructuring charges	$ 28	$ 34	$ 41	$ 45
Balance in severance accrual at end of period	15		15
Employee-related severance costs
Restructuring accrual
Balance in severance accrual at beginning of period			10
Payments made to terminated employees			(13)
Foreign exchange translation			(2)
Balance in severance accrual at end of period	15		15
Restructuring reserve, Expected to be paid in next 12 months	$ 14		14
Cost Smart Cost of Sales and SG&A Program \| Employee-related severance costs
Restructuring accrual
Restructuring charges			$ 20