OTHER CURRENT ASSETS - MARKETABLE SECURITIES AND OTHER SHORT-TERM INVESTMENTS (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Sep. 30, 2021 |
Sep. 30, 2020 |
Sep. 30, 2021 |
Sep. 30, 2020 |
Dec. 31, 2020 |
|
| Net Investment Income [Line Items] | |||||
| Marketable securities and other short-term investments | $ 451 | $ 451 | $ 346 | ||
| Marketable securities at fair value | 431 | 431 | 343 | ||
| Unrealized gains | 42 | $ 4 | 60 | $ 16 | |
| Foreign government securities | |||||
| Net Investment Income [Line Items] | |||||
| Marketable securities and other short-term investments | 231 | 231 | 207 | ||
| Corporate debt securities | |||||
| Net Investment Income [Line Items] | |||||
| Marketable securities and other short-term investments | 154 | 154 | 136 | ||
| Equity securities | |||||
| Net Investment Income [Line Items] | |||||
| Marketable securities and other short-term investments | 50 | 50 | 0 | ||
| Other | |||||
| Net Investment Income [Line Items] | |||||
| Marketable securities and other short-term investments | $ 16 | $ 16 | $ 3 | ||