Annual report pursuant to Section 13 and 15(d)

SHARE-BASED COMPENSATION - Narrative (Details)

v3.19.3.a.u2
SHARE-BASED COMPENSATION - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized 33    
Shares available for grant 17    
Tax benefit realized from exercise of options $ 3 $ 10 $ 5
Granted (in USD per share) $ 13.91 $ 14.98 $ 11.13
Total fair value of awards vested $ 69 $ 62 $ 53
Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 16 52 16
Award vesting period 4 years    
Cash received for exercises of stock options $ 2 $ 5 $ 11
Total unrecognized compensation cost related to nonvested awards $ 97    
Cost not yet recognized period for recognition 2 years 4 months 24 days    
Stock Option | Prior to May 2004      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards expiration period 10 years    
Stock Option | After May 2004      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards expiration period 7 years    
Restricted Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in USD per share) $ 0    
Performance Share Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Granted (in USD per share) $ 13.77