QUARTERLY FINANCIAL DATA (UNAUDITED) Narrative 1 (Details) - NuStar Energy LP [Member] - USD ($) $ in Millions	3 Months Ended
Jun. 30, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Gain related to NuStar Energy L.P.'s issuance of common limited partner units	$ 41.6
NuStar Energy's impairment charge on its term loan to Axeon Specialty Products LLC		$ 58.7

The profit or loss on sales of previously unissued stock by equity investees made to investors outside the consolidated group that is not reported as operating income. Represents the difference in the parent company's carrying amount of the equity interest in the subsidiary or equity investee immediately before and after the transaction.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration