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FAIR VALUE MEASUREMENTS (Schedule of Unrealized Gains (Losses) Related to Available-for-Sale Investments) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 1,858 | $ 1,799
Total Unrealized Gains | 1,444 | 1,514
Total Unrealized Losses | (20) | (10)
Total Fair Value | 3,282 | 3,303
Amount primarily related to deferred taxes on appreciation of investment value | 440 | 440
Short-term investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 28 | 23
Total Unrealized Gains | 0 | 0
Total Unrealized Losses | 0 | 0
Total Fair Value | 28 | 23
Global equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 475 | 524
Total Unrealized Gains | 1,405 | 1,463
Total Unrealized Losses | (1) | (2)
Total Fair Value | 1,879 | 1,985
Fixed-income securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,355 | 1,252
Total Unrealized Gains | 39 | 51
Total Unrealized Losses | (19) | (8)
Total Fair Value | $ 1,375 | $ 1,295

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