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FINANCIAL INSTRUMENTS - Fair value of call options (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2020
Disclosure of fair value measurement of equity [line items] |  |  |
Number of working days over which stock market prices are observed | 90 days |  |
Reconciliation of changes in fair value measurement, assets [abstract] |  |  |
Beginning balance, assets | $ 90,512 |  |
Ending balance, assets | 97,026 |  |
Call option on $1,000 mandatory convertible bonds | Level 3 |  |  |
Reconciliation of changes in fair value measurement, assets [abstract] |  |  |
Beginning balance, assets | 15 | $ 59 |
Change in fair value | (10) | 37 | $ (81)
Ending balance, assets | 5 | $ 96 | $ 59
Mandatorily convertible unsecured unsubordinated bonds |  |  |
Disclosure of fair value measurement of equity [line items] |  |  |
Notional amount | $ 1,000 |  |

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