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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Share-based Payment Arrangement, Cost by Plan [Table Text Block]
Stock Award Plan
We have a stock-based compensation plan under which stock options, SSARs, restricted stock, restricted stock units, and performance stock units are granted. At December 31, 2020, approximately three million shares were available under the current plan for these awards.
Year ended December 31,
202020192018
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)
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The following table summarizes stock awards as of December 31, 2020, as well as activity during the last year. 
Stock Options / SSARSRestricted stockRestricted Stock Units and Performance Stock Units
Number of AwardsWeighted
Average
Exercise Price		Number of AwardsWeighted Average Grant Date Fair ValueNumber of AwardsWeighted Average Grant Date Fair Value
Outstanding at December 31, 2019640,521 $15.56 78,968 $20.05 1,139,247 $24.82 
Granted— — — — 540,678 30.31 
Exercised(252,980)15.57 — — — — 
Vested— — (78,968)20.05 (358,987)22.55 
Forfeited— — — — (92,608)27.22 
Outstanding at December 31, 2020387,541 $15.56 — $— 1,228,330 $27.42 
Vested and expected to vest at December 31, 2020(1)
387,541 $15.56 — $— 1,228,330 $27.42 
Exercisable at December 31, 2020387,541 $15.56 — — — — 
Unrecognized compensation costs (in millions)$— $— $14 
To be recognized over weighted average period of years001.5
 _______________
(1)Expected to vest based upon historical forfeiture rate.