Annual report pursuant to Section 13 and 15(d)

EMPLOYEE BENEFIT PLANS - DEFINED CONTRIBUTION PLANS (Details)

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EMPLOYEE BENEFIT PLANS - DEFINED CONTRIBUTION PLANS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SUPPLEMENTAL SALARY DEFERRAL PLAN AND SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN      
Maximum percentage of salary which participant can defer under Huntsman supplemental deferral plan 75.00%    
Carrying amount of assets included in other noncurrent assets $ 39 $ 32  
Deferred compensation expense 1 1 $ 1
United States      
DEFINED CONTRIBUTION PLANS      
Total defined contribution expense 17 16 16
Non-U.S. Defined Benefit Plans      
DEFINED CONTRIBUTION PLANS      
Total defined contribution expense $ 4 $ 4 $ 5
Money purchase pension plan | United States      
DEFINED CONTRIBUTION PLANS      
Non-discretionary employer contributions (as a percent) 8.00%    
Salary deferral plan | United States | Maximum      
DEFINED CONTRIBUTION PLANS      
Employer contribution (as a percent of compensation) 4.00%    
Salary deferral plan for new hires | United States | Maximum      
DEFINED CONTRIBUTION PLANS      
Non-discretionary employer contributions (as a percent) 6.00%    
Employer contribution (as a percent of compensation) 4.00%    
Huntsman UK Pension Plan | Non-U.S. Defined Benefit Plans      
DEFINED CONTRIBUTION PLANS      
Transition period for contributions 5 years    
Employer contribution (as a percent of compensation) 15.00%    
Huntsman UK Pension Plan New Hires | Non-U.S. Defined Benefit Plans | Maximum      
DEFINED CONTRIBUTION PLANS      
Employer contribution (as a percent of compensation) 12.00%