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PAYROLL EXPENSE (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
employee
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Analysis of income and expense [abstract]      
Partnership, number of key employees or directors | employee 0    
Payroll expense $ 519 $ 309 $ 212
Payroll Expense [Line Items]      
Directors' remuneration expense 1 1 1
General Partner      
Payroll Expense [Line Items]      
Directors' remuneration expense $ 1 $ 1 $ 1