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FAIR VALUE MEASUREMENTS (Other Fair Value Narrative) (Details) $ in Millions | Mar. 31, 2020 USD ($) hedge_fund | Dec. 31, 2019 USD ($)
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Fair Value Disclosures [Abstract] |  |
Number of hedge funds with reporting lag | hedge_fund | 2 |
Entities that calculate net asset value per share, reporting lag, percent other investments | 71.00% | 68.00%
Reported value measurement |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Notes payable | $ 1,809 | $ 1,808
Estimate of fair value measurement |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Notes payable | $ 1,798 | $ 1,896

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