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Annual report pursuant to Section 13 and 15(d)

STOCK COMPENSATION PLANS - Stock Options (Details)

v3.20.4
STOCK COMPENSATION PLANS - Stock Options (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward] Ìý Ìý Ìý Ìý
Outstanding at beginning of year 563,230 563,230 599,870 Ìý
Granted shares 2,010,277 0 0 Ìý
Granted shares, weighted average exercise price $ 11.86 $ 0 $ 0 Ìý
Exercised, number of shares (79,973) 0 (36,640) Ìý
Exercised, weighted average exercise price $ 7.01 $ 0 $ 7.70 Ìý
Forfeited/canceled, shares (7,726) 0 0 Ìý
Forfeitured/canceled, weighted average exercise price $ 41.04 $ 0 $ 0 Ìý
Outstanding at end of year 2,485,808 563,230 563,230 Ìý
Outstanding, weighted average exercise price $ 11.60 $ 10.42 $ 10.42 $ 10.25
Exercisable, shares 2,172,052 563,230 563,230 Ìý
Exercisable, weighted average exercise price $ 11.86 $ 10.42 $ 10.42 Ìý
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 3 years 2 months 12 days Ìý Ìý Ìý
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 11 Ìý Ìý Ìý
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 2 years 6 months Ìý Ìý Ìý
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 9 Ìý Ìý Ìý
AK Steel [Member] Ìý Ìý Ìý Ìý
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward] Ìý Ìý Ìý Ìý
Granted shares 2,000,000.0 Ìý Ìý Ìý
Granted shares, weighted average exercise price $ 0.51 Ìý Ìý Ìý