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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019, approximately 3 million shares were available under the current plan for these awards.
 
Year ended December 31,
Dollar amounts in millions
2019
 
2018
 
2017
Total stock-based compensation expense (costs of sales, selling, general and administrative and other operating credits and charges, net)
$
9

 
$
8

 
$
10

Income tax benefit related to stock-based compensation
$
1

 
$
3

 
$
1

Impact on cash flow due to taxes paid related to net share settlement of equity awards
$
(5
)
 
$
(9
)
 
$
(6
)
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] The following table summarizes the grant-date fair value of options and SSARs and the assumptions used to develop the fair value estimates for options and SSARs granted during the year ended December 31, 2017:
Weighted average grant-date fair value of options
$
8.02

Risk-free interest rate
2.1
%
Expected volatility
41.0
%
Expected life (in years)
6
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The following table summarizes stock awards as of December 31, 2019, 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, 2018
1,141,686

 
$
15.50

 
240,174

 
$
17.43

 
956,614

 
$
23.17

Granted
—

 
—

 
—

 
—

 
674,059

 
24.16

Exercised
(497,076
)
 
15.38

 
—

 
—

 
—

 
—

Vested
—

 
—

 
(156,680
)
 
15.81

 
(356,161
)
 
18.57

Forfeited
(4,089
)
 
19.14

 
(4,526
)
 
19.14

 
(135,265
)
 
24.79

Outstanding at December 31, 2019
640,521

 
$
15.56

 
78,968

 
$
20.05

 
1,139,247

 
$
24.82

Vested and expected to vest at December 31, 2019(1)
640,521

 
$
15.56

 
75,020

 
$
20.05

 
1,048,862

 
$
24.82

Exercisable at December 31, 2019
570,473

 
$
15.13

 
—

 
—

 
—

 
$
—

Unrecognized compensation costs (in millions)
 
 
$
—

 
 
 
$
—

 
 
 
$
13

To be recognized over weighted-average period of years
 
 
0.1

 
 
 
0.1

 
 
 
1.5

 _______________
(1) 
Expected to vest based upon historical forfeiture rate