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FAIR VALUE MEASUREMENTS - Narrative (Details) $ in Millions	Dec. 31, 2019 USD ($) hedge_fund	Dec. 31, 2018 USD ($)
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Number of hedge funds with reporting lag | hedge_fund	2
Percentage of funds reported on a lag	68.00%	61.00%
Reported Value Measurement
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior notes	$ 1,808	$ 1,342
Estimate of Fair Value
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior notes	$ 1,896	$ 1,334

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Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Reporting Lag, Percent Other Investments

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Fair value portion of notes payable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20,22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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