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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]        
Total Global Growth and Efficiency Program charges, pretax $ 61 $ 142 $ 89 $ 188
Total Global Growth and Efficiency Program charges, aftertax 51 115 71 146
Cost of sales        
Restructuring Cost and Reserve [Line Items]        
Total Global Growth and Efficiency Program charges, pretax 5 21 11 35
Selling, general and administrative expenses        
Restructuring Cost and Reserve [Line Items]        
Total Global Growth and Efficiency Program charges, pretax 10 17 15 38
Other (income) expense, net        
Restructuring Cost and Reserve [Line Items]        
Total Global Growth and Efficiency Program charges, pretax 43 103 56 113
Non-service related postretirement costs        
Restructuring Cost and Reserve [Line Items]        
Total Global Growth and Efficiency Program charges, pretax $ 3 $ 1 $ 7 $ 2