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EMPLOYEE BENEFITS - Fair Value Estimated Using Net Asset Value per Share (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair value of investment $ 767 $ 768
Unfunded commitments 0  
Mutual funds | Equity Mutual Fund    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair value of investment [1] 9 39
Unfunded commitments [1] $ 0  
Mutual funds | Equity Mutual Fund | Minimum    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Redemption notice period [1] 1 day  
Mutual funds | Equity Mutual Fund | Maximum    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Redemption notice period [1] 7 days  
Common and collective funds | Global equities funds    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair value of investment [2] $ 220 241
Unfunded commitments [2] $ 0  
Common and collective funds | Global equities funds | Minimum    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Redemption notice period [2] 2 days  
Common and collective funds | Global equities funds | Maximum    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Redemption notice period [2] 3 days  
Common and collective funds | Balanced funds    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair value of investment [3] $ 196 0
Unfunded commitments [3] $ 0  
Common and collective funds | Balanced funds | Minimum    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Redemption notice period [3] 2 days  
Common and collective funds | Balanced funds | Maximum    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Redemption notice period [3] 3 days  
Common and collective funds | Fixed income fund    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair value of investment [4] $ 120 305
Unfunded commitments [4] $ 0  
Redemption notice period [4] 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]    
Fair value of investment [5] $ 20 0
Unfunded commitments [5] $ 0  
Redemption notice period [5] 1 day  
Limited partnerships | International equity funds    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair value of investment [6] $ 107 90
Unfunded commitments [6] $ 0  
Redemption notice period [6] 3 days  
Limited partnerships | International equity    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair value of investment [7] $ 95 84
Unfunded commitments [7] $ 0  
Redemption notice period [7] 10 days  
Limited partnerships | Offshore feeder fund    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair value of investment [8] $ 0 $ 9
Unfunded commitments [8] $ 0  
Target investment return (Percent) 8.00%  
Target investment return standard deviation (Percent) 5.00%  
Limited partnerships | Offshore feeder fund | Minimum    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Redemption notice period [8] 1 day  
Limited partnerships | Offshore feeder fund | Maximum    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Redemption notice period [8] 14 days  
[1] 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 principle investment objective is to generate positive total return.
[2] The global equities funds objective is to track the MSCI All Country World Index.
[3] The balanced funds seek to maximize total return by investing in global equities and fixed income transferable securities which may include some high yield income transferable securities. The funds may invest in securities denominated in currencies other than U.S. dollars.
[4] The fixed income fund seeks to outperform the Barclay’s Capital US Long Corporate Bond Index or similar benchmark.
[5] The managed portfolio fixed income mutual fund seeks to outperform the Barclay’s U.S. Long Credit Index or similar benchmark.
[6] The international equity fund seeks to medium to long-term capital appreciation principally through global investments in readily marketable high-quality equity securities of companies with improving fundamentals and attractive valuations.
[7] The international equity limited partnership seeks to outperform the MSCI World Index by investing primarily in the common stock of Non-U.S. issuers.
[8] The offshore feeder fund operates under a “master/feeder” structure whereby it invests substantially all of its assets in GMO Multi-Strategy Fund (Onshore) (the “master fund”). The investment objective of the master fund is capital appreciation with a target performance of the Citigroup Three-Month Treasury Bill plus 8% with a standard deviation of 5%. The investment adviser plans to pursue the master fund’s objective through a combination of investments in other pooled vehicles.