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STOCK-BASED AWARD PLANS (Tables)
 3 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [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,
 
 
2019
 
2018
Share based compensation expense
 
$
8

 
$
9
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):
 
 
As of March 31, 2019
 
 
Unrecognized stock-
based compensation    
 
    Weighted-average years    
to be recognized
Restricted stock awards
 
$
1

 
1.0
Restricted stock units
 
$
29

 
2.0