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Stock-Based Compensation (Tables) | 12 Months Ended
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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,
| 2020 |  | 2019 |  | 2018
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 / SSARS |  | Restricted stock |  | Restricted Stock Units and Performance Stock Units
| Number of Awards |  | Weighted Average Exercise Price |  | Number of Awards |  | Weighted Average Grant Date Fair Value |  | Number of Awards |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2019 | 640,521 |  |  | $ | 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, 2020 | 387,541 |  |  | $ | 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, 2020 | 387,541 |  |  | $ | 15.56 |  |  | — |  |  | — |  |  | — |  |  | — |
Unrecognized compensation costs (in millions) |  |  | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 14 |
To be recognized over weighted average period of years |  |  | 0 |  |  |  | 0 |  |  |  | 1.5
_______________ (1)Expected to vest based upon historical forfeiture rate.

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock options and stock appreciation rights that were outstanding at the beginning and end of the year, exercisable at the end of the year, and the number of stock options and stock appreciation rights that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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