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EMPLOYEE BENEFITS - Fair Value Estimated Using Net Asset Value per Share (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments measured at net asset value $ 918 [1] $ 767
Unfunded commitments 0  
Mutual funds | Liquid Cash Fund    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments measured at net asset value 9 0
Unfunded commitments $ 0  
Redemption notice period 0 days  
Mutual funds | Equity Mutual Fund    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments measured at net asset value [2] $ 40 9
Unfunded commitments [2] $ 0  
Redemption notice period [2] 7 days  
Common and collective funds | Global equities funds    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments measured at net asset value $ 386 220
Unfunded commitments $ 0  
Redemption notice period 3 days  
Common and collective funds | Balanced funds    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments measured at net asset value $ 193 196
Unfunded commitments $ 0  
Redemption notice period 2 days  
Common and collective funds | Fixed income fund    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments measured at net asset value $ 133 120
Unfunded commitments $ 0  
Redemption notice period 3 days  
Managed portfolio, fixed income mutual fund | Managed Portfolio, Fixed Income Mutual Fund    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments measured at net asset value [3] $ 30 20
Unfunded commitments [3] $ 0  
Redemption notice period [3] 1 day  
Limited partnerships | International equity funds    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments measured at net asset value $ 117 107
Unfunded commitments $ 0  
Redemption notice period 3 days  
Limited partnerships | International equity    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments measured at net asset value $ 0 95
Unfunded commitments $ 0  
Redemption notice period 10 days  
Limited partnerships | Offshore feeder fund    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Investments measured at net asset value $ 10 $ 0
Unfunded commitments $ 0  
Redemption notice period 14 days  
[1] Certain investments that were measured at net asset value per share (or its equivalent) have not been classified in the fair value hierarchy.
[2] The equity mutual fund seeks to offer participants capital appreciation by primarily investing in common stocks via investments in several underlying funds of the same fund family. The principal investment objective is to generate positive total return.
[3] The managed portfolio fixed income mutual fund seeks to outperform the Barclay’s U.S. Long Credit Index or similar benchmark.