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Restructuring and Related Implementation Charges - Summary of Restructuring and Related Costs (Details) - Global Growth and Efficiency Program - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]    
Total Global Growth and Efficiency Program charges, pretax $ 28 $ 46
Total Global Growth and Efficiency Program charges, aftertax 20 31
Cost of sales    
Restructuring Cost and Reserve [Line Items]    
Total Global Growth and Efficiency Program charges, pretax 6 14
Selling, general and administrative expenses    
Restructuring Cost and Reserve [Line Items]    
Total Global Growth and Efficiency Program charges, pretax 5 21
Other (income) expense, net    
Restructuring Cost and Reserve [Line Items]    
Total Global Growth and Efficiency Program charges, pretax 13 10
Non-service related postretirement costs    
Restructuring Cost and Reserve [Line Items]    
Total Global Growth and Efficiency Program charges, pretax $ 4 $ 1