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EMPLOYEE BENEFIT PLANS - AMOUNTS RECOGNIZED IN CONSOLIDATED BALANCE SHEETS (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Liability, Defined Benefit Plan [Abstract] |  |
Accrued benefit liability-long term | $ 665 | $ 571
Qualified Defined Benefit [Member] |  |
Liability, Defined Benefit Plan [Abstract] |  |
Accrued benefit liability-long term | 502 | 412
Plan assets-long term (within Other noncurrent assets) | (51) | (49)
Total liability recognized | 451 | 363
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |
Prior service credit | (5) | (6)
Net loss | 626 | 595
Amount recognized in AOCL (pretax) | $ 621 | $ 589

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 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=121641772&loc=SL7669686-108580 + Details
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