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FAIR VALUE MEASUREMENTS (Other Fair Value Narrative) (Details) $ in Millions | Jun. 30, 2019 USD ($) hedge_fund | Dec. 31, 2018 USD ($)
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Number of hedge funds with reporting lag | hedge_fund | 2 |
Entities that calculate net asset value per share, reporting lag, percent other investments | 64.00% | 61.00%
Reported Value Measurement |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Notes payable | $ 1,388 | $ 1,342
Estimate of fair value measurement |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Notes payable | $ 1,443 | $ 1,334

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