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COMMON STOCK - Employee and Director Stock Plans (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
shares
Option Awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Estimated annual forfeiture rate 6.40%
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 4 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%