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STOCK COMPENSATION - Performance Shares Narrative (Details)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Feb. 29, 2020
$ / shares
shares
Feb. 28, 2019
$ / shares
shares
Dec. 31, 2019
USD ($)
type
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
Dec. 31, 2017
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares converted (in shares)   1,700,000      
Shares converted (in dollars per share) | $ / shares   $ 49.24      
Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of performance share units issued under performance share plan     3 years    
Minimum percentage of transfer performance shares to common stock based on actual total shareholder return     0.00%    
Maximum percentage of transfer performance shares to common stock based on actual total shareholder return     200.00%    
Number of types of PSUs | type     3    
Performance share units, unvested (in shares)     2,500,000 2,500,000  
Equity instruments, vested (in shares)     1,200,000    
Equity instrument, granted (in shares)     1,200,000    
Unrecognized compensation cost | $     $ 31    
Total unrecognized compensation cost related to award, weighted average period     12 months    
EPS-based and ROE-based Performance Share Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period of performance share units issued under performance share plan     3 years    
Equity instrument granted in period, weighted average grant date fair value (in dollars per share) | $ / shares     $ 49.38 $ 43.49 $ 49.21
Subsequent Event          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares converted (in shares) 1,800,000        
Shares converted (in dollars per share) | $ / shares $ 68.59