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EMPLOYEE BENEFIT PLANS - PLAN ASSETS AND FUTURE PAYMENTS (DETAILS) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Estimated Future Benefit Payments      
Employee defined contribution plans $ 11 $ 12 $ 12
Pension Benefits      
Target Asset Allocation      
Fair value of plan assets 689 650 $ 614
Estimated contribution by employer, next fiscal year 15    
Estimated Future Benefit Payments      
2016 37    
2017 39    
2018 41    
2019 43    
2020 45    
2021 and onwards 252    
Pension Benefits | Fair value      
Target Asset Allocation      
Fair value of plan assets 689 650  
Pension Benefits | Cash | Fair value      
Target Asset Allocation      
Fair value of plan assets $ 81 3  
Pension Benefits | Equities Mutual Funds      
Target Asset Allocation      
Target asset allocation (as a percent) 60.00%    
Pension Benefits | Equities Mutual Funds | Fair value      
Target Asset Allocation      
Fair value of plan assets $ 354 368  
Pension Benefits | Fixed income securities Mutual Funds      
Target Asset Allocation      
Target asset allocation (as a percent) 40.00%    
Pension Benefits | Fixed income securities Mutual Funds | Fair value      
Target Asset Allocation      
Fair value of plan assets $ 242 263  
Pension Benefits | Others | Fair value      
Target Asset Allocation      
Fair value of plan assets 12 16  
Pension Benefits | Level 1      
Target Asset Allocation      
Fair value of plan assets 467 407  
Pension Benefits | Level 1 | Cash      
Target Asset Allocation      
Fair value of plan assets 81 3  
Pension Benefits | Level 1 | Equities Mutual Funds      
Target Asset Allocation      
Fair value of plan assets 306 310  
Pension Benefits | Level 1 | Fixed income securities Mutual Funds      
Target Asset Allocation      
Fair value of plan assets 80 92  
Pension Benefits | Level 1 | Others      
Target Asset Allocation      
Fair value of plan assets   2  
Pension Benefits | Level 2      
Target Asset Allocation      
Fair value of plan assets 222 243  
Pension Benefits | Level 2 | Equities Mutual Funds      
Target Asset Allocation      
Fair value of plan assets 48 58  
Pension Benefits | Level 2 | Fixed income securities Mutual Funds      
Target Asset Allocation      
Fair value of plan assets 162 171  
Pension Benefits | Level 2 | Others      
Target Asset Allocation      
Fair value of plan assets 12 $ 14  
Postretirement Benefits      
Target Asset Allocation      
Estimated contribution by employer, next fiscal year 6    
Estimated Future Benefit Payments      
2016 6    
2017 6    
2018 6    
2019 6    
2020 5    
2021 and onwards $ 23