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Common Stock Plan (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Payment Arrangement, Additional Disclosure [Abstract]      
Total stock-based compensation expense (costs of sales, selling, general and administrative and other operating credits and charges, net) $ 12 $ 9 $ 8
Income tax benefit related to stock-based compensation 2 1 3
Impact on cash flow due to taxes paid related to net share settlement of equity awards $ (5) $ (5) $ (9)
Options and SSARs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 3