NET INCOME PER COMMON UNIT (Tables)

3 Months Ended

Mar. 31, 2020

Earnings Per Share [Abstract]

Schedule of net income per common unit

Net income per common unit was determined as follows:

(unaudited)	Three months ended March 31,
(millions of dollars, except per common unit amounts)	2020			2019
Net income attributable to controlling interests	88			93
Net income attributable to the General Partner	(2		)	(2		)
Net income attributable to common units	86			91
Weighted average common units outstanding (millions) — basic and diluted	71.3			71.3
Net income per common unit — basic and diluted		$1.21			$1.28