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COMMON STOCK - Employee and Director Stock Plans (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2021
Option Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Estimated annual forfeiture rate 6.40%      
Average risk-free interest rate 0.30% 2.30% 2.90%  
Expected volatility 33.00% 30.00% 29.00%  
MRSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Average risk-free interest rate 0.20% 2.20% 2.70%  
Expected volatility 32.70% 29.40% 29.70%  
ESPP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Average risk-free interest rate 1.30% 2.40% 1.70%  
Expected volatility 33.00% 27.00% 31.00%  
The Program        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock available for issuance (in shares) 327,600,000      
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) 33,600,000      
Nonemployee Directors Program        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock available for issuance (in shares) 8,400,000      
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) 120,000      
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) 48,000      
ESPP | ESPP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock available for issuance (in shares) 45,900,000      
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%      
ESPP | ESPP | Subsequent Event        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum percentage of compensation employees can authorize to be withheld for common stock purchases       15.00%