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FAIR VALUE MEASUREMENTS (Schedule of Unrealized Gains (Losses) Related to Available-for-Sale Investments) (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 2,310 | $ 2,180
Total Unrealized Gains | 2,118 | 2,033
Total Unrealized Losses | (18) | (4)
Total Fair Value | 4,410 | 4,209
Amount primarily related to deferred taxes on appreciation of investment value | 740 | 671
Short-term investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 25 | 27
Total Unrealized Gains | 0 | 0
Total Unrealized Losses | 0 | 0
Total Fair Value | 25 | 27
Global equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 500 | 543
Total Unrealized Gains | 2,013 | 1,881
Total Unrealized Losses | (7) | (1)
Total Fair Value | 2,506 | 2,423
Fixed-income securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,785 | 1,610
Total Unrealized Gains | 105 | 152
Total Unrealized Losses | (11) | (3)
Total Fair Value | $ 1,879 | $ 1,759

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