Annual report pursuant to Section 13 and 15(d)

STOCK COMPENSATION PLANS - Stock Options (Details)

v3.22.0.1
STOCK COMPENSATION PLANS - Stock Options (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Mar. 13, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]        
Outstanding at beginning of year (in shares)   2,485,808 563,230 563,230
Outstanding at beginning of year, weighted average exercise price (in dollars per share)   $ 11.60 $ 10.42 $ 10.42
Exercised (in shares)   (1,457,495) (79,973) 0
Exercised, weighted average exercise price (in dollars per share)   $ 10.36 $ 7.01 $ 0
Forfeited/canceled (in shares)   (26,253) (7,726) 0
Forfeitured/canceled, weighted average exercise price (in dollars per share)   $ 36.48 $ 41.04 $ 0
Outstanding at end of year (in shares)   1,002,060 2,485,808 563,230
Outstanding at end of year, weighted average exercise price (in dollars per share)   $ 12.75 $ 11.60 $ 10.42
Exercisable (in shares)   904,574 2,172,052 563,230
Exercisable, weighted average exercise price (in dollars per share)   $ 13.35 $ 11.86 $ 10.42
Intrinsic value of options exercised   $ 13    
Weighted-average remaining contractual life of options outstanding   3 years    
Aggregate intrinsic value of options outstanding   $ 10    
Weighted-average remaining contractual life of options exerciseable   2 years 7 months 6 days    
Aggregate intrinsic value of options exerciseable   $ 8    
AK Steel        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]        
Granted (in shares) 2,000,000 0 2,010,277 0
Granted, weighted average exercise price (in dollars per share) $ 0.51 $ 0 $ 11.86 $ 0