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COMMON STOCK - Employee and Director Stock Plans (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
May 11, 2017
Option Awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Estimated annual forfeiture rate 6.50%  
The Program    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock available for issuance (in shares)   109,200,000
The Program | Option Awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expiration date 7 years  
The Program | Option Awards | Low    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 3 years  
The Program | Option Awards | High    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 4 years  
The Program | Restricted stock units | Low    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 3 years  
The Program | Restricted stock units | High    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 5 years  
The Program | MRSUs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 3 years  
The Program | Restricted stock or restricted stock units | High    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock available for issuance (in shares)   11,200,000
Nonemployee Directors Program    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock available for issuance (in shares) 2,800,000  
Nonemployee Directors Program | Annual award to nonemployee director    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Limit on total value of the award $ 0.2  
Nonemployee Directors Program | Option Awards | Awards granted in 2012 and later    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 1 year  
Nonemployee Directors Program | Option Awards | High | Annual award to nonemployee director    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock available for issuance (in shares) 40,000  
Nonemployee Directors Program | Restricted stock units | High | Annual award to nonemployee director    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock available for issuance (in shares) 16,000  
ESPP | ESPP    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock available for issuance (in shares) 15,300,000  
Percentage of lower of fair market value of common stock on effective date of subscription or date of purchase 85.00%  
Maximum percentage of compensation employees can authorize to be withheld for common stock purchases 12.00%