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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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