Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION PLANS - NONVESTED SHARES (Details)

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STOCK-BASED COMPENSATION PLANS - NONVESTED SHARES (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Nonvested shares      
Additional information      
Total unrecognized compensation cost $ 22    
Weighted-average period over which cost is expected to be recognized (years) 1 year 9 months 18 days    
Value of share awards vested $ 24 $ 24 $ 22
Performance Awards      
STOCK-BASED COMPENSATION PLANS      
Weighted-average expected volatility rate 34.60% 44.30% 45.00%
Weighted-average risk-free interest rate (as a percent) 2.50% 2.30% 1.50%
Additional information      
Performance period 3 years    
Number of target shares awarded for grant 412,246    
Number of shares vested above target 357,006    
Grant date fair value of shares vested above target $ 10.22    
Equity Awards      
Shares      
Nonvested at the beginning of the period (in shares) 1,923,000    
Granted (in shares) 709,000    
Vested (in shares) (974,000)    
Forfeited (in shares) (18,000)    
Nonvested at the end of the period (in shares) 1,640,000 1,923,000  
Weighted Average Grant-Date Fair Value      
Nonvested at the beginning of the period (in dollars per share) $ 19.08    
Granted (in dollars per share) 24.60    
Vested (in dollars per share) 13.65    
Forfeited (in dollars per share) 26.29    
Nonvested at the end of the period (in dollars per share) $ 24.61 $ 19.08  
Liability Awards      
Shares      
Nonvested at the beginning of the period (in shares) 504,000    
Granted (in shares) 256,000    
Vested (in shares) (313,000)    
Forfeited (in shares) (20,000)    
Nonvested at the end of the period (in shares) 427,000 504,000  
Weighted Average Grant-Date Fair Value      
Nonvested at the beginning of the period (in dollars per share) $ 20.66    
Granted (in dollars per share) 22.64    
Vested (in dollars per share) 16.32    
Forfeited (in dollars per share) 25.33    
Nonvested at the end of the period (in dollars per share) $ 24.80 $ 20.66  
Restricted stock units      
Shares      
Vested (in shares) (30,486)    
Additional information      
Units vested but not yet issued 389,095