FAIR VALUE MEASUREMENTS (Other Fair Value Narrative) (Details) $ in Millions	Sep. 30, 2020 USD ($) hedge_fund	Dec. 31, 2019 USD ($)
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	74.00%	68.00%
Reported value measurement
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Notes payable	$ 1,309	$ 1,808
Estimate of fair value measurement
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Notes payable	$ 1,431	$ 1,896