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Restructuring and Related Implementation Charges - Summary of Restructuring and Related Costs (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]              
Total Global Growth and Efficiency Program charges, pretax         $ (13) $ 57 $ 88
Global Growth and Efficiency Program              
Restructuring Cost and Reserve [Line Items]              
Total Global Growth and Efficiency Program charges, pretax           132 161
Total Global Growth and Efficiency Program charges, aftertax           102 125
Global Growth and Efficiency Program | Cost of sales              
Restructuring Cost and Reserve [Line Items]              
Total Global Growth and Efficiency Program charges, pretax $ (1) $ 1 $ 3 $ 11   8 31
Global Growth and Efficiency Program | Selling, general and administrative expenses              
Restructuring Cost and Reserve [Line Items]              
Total Global Growth and Efficiency Program charges, pretax           60 33
Global Growth and Efficiency Program | Other (income) expense, net              
Restructuring Cost and Reserve [Line Items]              
Total Global Growth and Efficiency Program charges, pretax           57 88
Global Growth and Efficiency Program | Non-service related postretirement costs              
Restructuring Cost and Reserve [Line Items]              
Total Global Growth and Efficiency Program charges, pretax           $ 7 $ 9