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FINANCIAL INSTRUMENTS AND DERIVATIVES - ADDITIONAL INFORMATION (Details) - USD ($) $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
May 26, 2020 | Apr. 07, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 11, 2019
Derivative [Line Items] |  |  |  |  |  |
Effective portion reclassified from AOCI into income (expense) |  | $ 48 |  |  |  |
Senior Unsecured Notes Maturing June 1, 2030 | Senior Notes |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Debt instrument face amount | $ 750 |  |  |  |  |
Cash Flow Hedges | Designated as Hedging Instrument |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount |  |  | $ 369 |  |  |
Gain (Loss) in AOCI |  |  | (18) | $ (17) | $ 5 |
Effective portion reclassified from AOCI into income (expense) |  |  | $ (2) | $ (1) | $ (11) |
Foreign exchange forward contracts | Cash Flow Hedges | Designated as Hedging Instrument |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Debt instrument, term |  |  | 18 months |  |  |
Notional amount |  |  | $ 369 |  |  |
Treasury Lock | Cash Flow Hedges |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Debt instrument, term | 10 years |  |  |  |  |
Repayments of debt | $ 31 |  |  |  |  |
Notional amount |  |  |  |  |  | $ 150
Long-term debt, term |  |  |  |  |  | 10 years
Treasury Lock | Cash Flow Hedges | Senior Unsecured Notes Maturing June 1, 2030 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ 150 |  |  |  |  |
Cross currency basis swaps | Designated as Hedging Instrument |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Gain (Loss) in AOCI |  |  | $ (3) |  |  |

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