Annual report pursuant to Section 13 and 15(d)

SHARE-BASED COMPENSATION - Narrative (Details)

v3.20.4
SHARE-BASED COMPENSATION - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized 33    
Shares available for grant 5    
Tax benefit realized from exercise of options $ 1 $ 3 $ 10
Granted (in USD per share) $ 8.90 $ 13.91 $ 14.98
Total fair value of awards vested $ 86 $ 69 $ 62
After May 2015      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards expiration period 10 years    
Before May 2015      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards expiration period 7 years    
Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 4 years    
Total intrinsic value of options exercised $ 6 16 52
Cash received for exercises of stock options 1 $ 2 $ 5
Total unrecognized compensation cost related to nonvested awards $ 91    
Cost not yet recognized period for recognition 2 years 4 months 24 days    
Performance Share Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Granted (in USD per share) $ 8.57