Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION PLAN - NONVESTED SHARES (Details)

v3.7.0.1
STOCK-BASED COMPENSATION PLAN - NONVESTED SHARES (Details)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2017
USD ($)
$ / shares
shares
Jun. 30, 2016
USD ($)
Performance Awards    
STOCK-BASED COMPENSATION PLAN    
Weighted-average volatility rate 45.00% 39.30%
Risk-free interest rate (as a percent) 1.50% 0.90%
Performance Awards | Maximum    
Additional information    
Performance period 3 years 3 years
Equity Awards    
Shares    
Nonvested at the beginning of the period (in shares) 2,996,000  
Granted (in shares) 779,000  
Vested (in shares) (903,000)  
Forfeited (in shares) (15,000)  
Nonvested at the end of the period (in shares) 2,857,000  
Weighted Average Grant-Date Fair Value    
Nonvested at the beginning of the period (in dollars per share) | $ / shares $ 13.36  
Granted (in dollars per share) | $ / shares 22.60  
Vested (in dollars per share) | $ / shares 16.23  
Forfeited (in dollars per share) | $ / shares 15.63  
Nonvested at the end of the period (in dollars per share) | $ / shares $ 14.97  
Liability Awards    
Shares    
Nonvested at the beginning of the period (in shares) 912,000  
Granted (in shares) 285,000  
Vested (in shares) (366,000)  
Forfeited (in shares) (28,000)  
Nonvested at the end of the period (in shares) 803,000  
Weighted Average Grant-Date Fair Value    
Nonvested at the beginning of the period (in dollars per share) | $ / shares $ 12.27  
Granted (in dollars per share) | $ / shares 21.01  
Vested (in dollars per share) | $ / shares 14.07  
Forfeited (in dollars per share) | $ / shares 12.48  
Nonvested at the end of the period (in dollars per share) | $ / shares $ 14.55  
Restricted stock units    
Shares    
Vested (in shares) (25,704)  
Additional information    
Units vested but not yet issued 480,604  
Nonvested shares    
Additional information    
Total unrecognized compensation cost | $ $ 42  
Weighted-average period over which cost is expected to be recognized 2 years  
Value of share awards vested | $ $ 20 $ 15