OTHER CURRENT ASSETS - MARKETABLE SECURITIES AND OTHER SHORT-TERM INVESTMENTS (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2020 |
Jun. 30, 2019 |
Jun. 30, 2020 |
Jun. 30, 2019 |
Dec. 31, 2019 |
|
| Net Investment Income [Line Items] | |||||
| Marketable securities and other short-term investments | $ 321 | $ 321 | $ 393 | ||
| Marketable securities at fair value | 320 | 320 | 387 | ||
| Unrealized gains | 21 | $ 154 | 12 | $ 159 | |
| Foreign government securities | |||||
| Net Investment Income [Line Items] | |||||
| Marketable securities and other short-term investments | 190 | 190 | 212 | ||
| Corporate debt securities | |||||
| Net Investment Income [Line Items] | |||||
| Marketable securities and other short-term investments | 130 | 130 | 161 | ||
| Equity securities | |||||
| Net Investment Income [Line Items] | |||||
| Marketable securities and other short-term investments | 0 | 0 | 14 | ||
| Other | |||||
| Net Investment Income [Line Items] | |||||
| Marketable securities and other short-term investments | $ 1 | $ 1 | $ 6 | ||