QUARTERLY FINANCIAL DATA (UNAUDITED) Narrative 1 (Details) - NuStar Energy [Member] - USD ($) $ in Millions	3 Months Ended
Dec. 31, 2016	Mar. 31, 2015
Schedule of Equity Method Investments [Line Items]
NuStar Energy's impairment charge on its term loan to Axeon Specialty Products LLC	$ 58.7
NuStar Energy's gain in association with its Linden Acquisition		$ 56.3

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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