Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION PLAN - NONVESTED SHARES (Details)

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STOCK-BASED COMPENSATION PLAN - NONVESTED SHARES (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
STOCK-BASED COMPENSATION PLAN      
Vesting period 3 years    
Performance Awards      
STOCK-BASED COMPENSATION PLAN      
Vesting period 2 years    
Weighted-average volatility rate 39.30% 30.00%  
Risk-free interest rate (as a percent) 0.90% 0.70%  
Shares      
Granted (in shares)     0
Performance Awards | Minimum      
Additional information      
Performance period 2 years    
Performance Awards | Maximum      
Additional information      
Performance period 3 years    
Equity Awards      
Shares      
Nonvested at the beginning of the period (in shares) 1,854,000    
Granted (in shares) 1,889,000    
Vested (in shares) (671,000)    
Forfeited (in shares) (76,000)    
Nonvested at the end of the period (in shares) 2,996,000 1,854,000  
Weighted Average Grant-Date Fair Value      
Nonvested at the beginning of the period (in dollars per share) $ 19.97    
Granted (in dollars per share) 9.28    
Vested (in dollars per share) 19.74    
Forfeited (in dollars per share) 16.42    
Nonvested at the end of the period (in dollars per share) $ 13.36 $ 19.97  
Liability Awards      
Shares      
Nonvested at the beginning of the period (in shares) 475,000    
Granted (in shares) 715,000    
Vested (in shares) (243,000)    
Forfeited (in shares) (35,000)    
Nonvested at the end of the period (in shares) 912,000 475,000  
Weighted Average Grant-Date Fair Value      
Nonvested at the beginning of the period (in dollars per share) $ 21.37    
Granted (in dollars per share) 9.09    
Vested (in dollars per share) 20.18    
Forfeited (in dollars per share) 15.74    
Nonvested at the end of the period (in dollars per share) $ 12.27 $ 21.37  
Restricted stock units      
Shares      
Vested (in shares) (60,948)    
Additional information      
Number of restricted stock units vested at the balance sheet date (in shares) 454,900    
Nonvested shares      
Additional information      
Total unrecognized compensation cost $ 28    
Weighted-average period over which cost is expected to be recognized 1 year 10 months 24 days    
Value of share awards vested $ 16 $ 20 $ 19