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STOCK-BASED AWARD PLANS (Tables)
3 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Compensation Expense Related to Stock-Based Awards
Compensation expense related to our stock-based awards was as follows (in millions):
Three Months Ended March 31,
20212020
Stock-based compensation expense $$
Unrecognized Stock-based Compensation Expense
Unrecognized stock-based compensation expense and weighted-average years to be recognized are as follows (in millions, except for weighted average years):
 March 31, 2021
 Unrecognized stock-based compensationWeighted-average years to be recognized
Restricted stock units$18 1.7
Performance awards$2.1
Stock options$1.7