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STOCK-BASED COMPENSATION - Phantom Stock Awards and Stock Appreciation Rights ("SARs") (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Phantom Stock Awards      
Stock-based compensation      
Recognized expense (income) related to valuation $ 5 $ 5 $ 5
Granted (in shares) 134,560 183,530 165,180
Fair value of stock award granted $ 4 $ 4 $ 3
Cash paid to settle awards 6 5 4
Accrued compensation cost liability 13 13  
Unrecognized compensation cost $ 4 $ 4  
Equivalent common shares 1,000,000 1,000,000  
Phantom Stock Awards | Minimum      
Stock-based compensation      
Vesting period 5 years    
Phantom Stock Awards | Maximum      
Stock-based compensation      
Vesting period 10 years    
Stock Appreciation Rights      
Stock-based compensation      
Vesting period 5 years    
Recognized expense (income) related to valuation $ 6 $ 1 $ 2
Accrued compensation cost liability $ 10 $ 7  
Equivalent common shares 1,000,000 1,000,000