Restructuring and Related Implementation Charges - Summary of Restructuring and Related Costs (Details) - Global Growth and Efficiency Program - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]
Total Global Growth and Efficiency Program charges, pretax	$ 42	$ 61	$ 71	$ 89
Total Global Growth and Efficiency Program charges, aftertax	31	51	53	71
Cost of sales
Restructuring Cost and Reserve [Line Items]
Total Global Growth and Efficiency Program charges, pretax	(3)	5	8	11
Selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Total Global Growth and Efficiency Program charges, pretax	10	10	14	15
Other (income) expense, net
Restructuring Cost and Reserve [Line Items]
Total Global Growth and Efficiency Program charges, pretax	33	43	46	56
Non-service related postretirement costs
Restructuring Cost and Reserve [Line Items]
Total Global Growth and Efficiency Program charges, pretax	$ 2	$ 3	$ 3	$ 7