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STOCK-BASED COMPENSATION - Phantom Stock Awards and Stock Appreciation Rights ("SARs") (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Phantom Stock Awards      
Stock-based compensation      
Recognized expense (income) related to valuation $ 2 $ 5 $ 5
Granted (in shares) 140,710 134,560 183,530
Fair value of stock award granted $ 4 $ 4 $ 4
Cash paid to settle awards 5 6 5
Accrued compensation cost liability 10 13  
Unrecognized compensation cost $ 4 $ 4  
Equivalent common shares (in shares) 0 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 $ 2 $ 6 $ 1
Accrued compensation cost liability 8 10  
Unrecognized compensation cost $ 0 $ 0  
Equivalent common shares (in shares) 1,000,000 1,000,000