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FINANCIAL INSTRUMENTS (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Feb. 28, 2019 | Dec. 31, 2018
Derivative [Line Items] |  |  |  |  |
Accumulated net loss from designated or qualifying cash flow hedges |  |  | $ (39) |  | $ (59)
Cash Flow Hedging |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Accumulated net loss from designated or qualifying cash flow hedges |  |  | (4) |  | (9)
Cash Flow Hedging | Forecast |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Net amount of deferred gains and losses on cash flow hedges that is expected to be reclassified within the next 12 months |  | $ 2 |  |  |
Cash Flow Hedging | Treasury Lock |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount |  |  |  | $ 250 |
Gain (loss) on derivatives | $ (1) |  |  |  |
Cash Flow Hedging | Forward-starting Interest Rate Swap Agreements |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount |  |  | 400 |  |
Gain (loss) on derivatives |  |  | 6 |  |
Fair Value Hedging |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount |  |  | 1,200 |  | 1,200
Fair Value Hedging | Long-term Debt |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Hedged liability, cumulative increase (decrease) |  |  | $ 25 |  | $ 40
Fair Value Hedging | LIBOR | Minimum |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Interest rate spread |  |  | 2.20% |  |
Fair Value Hedging | LIBOR | Maximum |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Interest rate spread |  |  | 3.00% |  |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e681-108580 + Details
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