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LONG-TERM DEBT - CREDIT FACILITY (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Jan. 31, 2018 | Dec. 31, 2017
Dolphin Energy |  |  |
LONG-TERM DEBT |  |  |
Notional amount of limited recourse guarantees with respect to Dolphin Energy's debt | $ 244,000,000 |  | $ 272,000,000
Revolving Credit Facility | Line of Credit | 2014 Credit Facility |  |  |
LONG-TERM DEBT |  |  |
Credit Facility, maximum borrowing capacity | $ 2,000,000,000.0 |  |
Average annual facility fee as percent of the total commitment amounts | 0.08% |  |
Revolving Credit Facility | Line of Credit | 2018 Credit Facility |  |  |
LONG-TERM DEBT |  |  |
Credit Facility, maximum borrowing capacity |  | $ 3,000,000,000.0 |

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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248 + Details
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