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FAIR VALUE MEASUREMENTS - Notional Amount of Foreign Currency Exchange Derivatives (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2021 | Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Losses on foreign currency exchange derivatives |  | $ 10 |  | $ 0 | $ 18 | $ 31 |
Recurring Basis |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Assets at fair value |  | 14,859 |  |  | 14,859 |  | $ 14,054
Recurring Basis | Level 2 |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Assets at fair value |  | 530 |  |  | 530 |  | 534
Foreign currency exchange derivatives | Not Designated as Hedging Instrument | Foreign currency purchases |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Notional amount |  | 867 |  |  | 867 |  | 898
Foreign currency exchange derivatives | Not Designated as Hedging Instrument | Foreign currency sales |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Notional amount |  | 1,559 |  |  | 1,559 |  | 839
Foreign currency exchange derivatives | Not Designated as Hedging Instrument | Recurring Basis |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Assets at fair value |  | 8 |  |  | 8 |  | 9
Liabilities at fair value |  | 11 |  |  | 11 |  | 7
Foreign currency exchange derivatives | Not Designated as Hedging Instrument | Recurring Basis | Level 2 |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Assets at fair value |  | 8 |  |  | 8 |  | 9
Liabilities at fair value |  | $ 11 |  |  | $ 11 |  | $ 7
Reverse Treasury Lock | Designated as Hedging Instrument | Cash Flow Hedging |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Notional amount |  |  | $ 1,800 |  |  |  |
Unrealized losses |  |  | $ 15 |  |  |  |
Payments for reverse treasury lock agreements | $ 15 |  |  |  |  |  |

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