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Restructuring and Impairment Charges - Employee-related severance (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Restructuring accrual
Balance in severance accrual at beginning of period			$ 10
Restructuring charges	$ 9	$ 8	13	$ 11
Payments made to terminated employees			(9)
Balance in severance accrual at end of period	6		6
Employee-related severance costs
Restructuring accrual
Restructuring reserve, Expected to be paid in next 12 months	$ 5		5
Cost Smart Cost of Sales and SG&A Program
Restructuring accrual
Restructuring charges			$ 5