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EMPLOYEE RETIREMENT PLANS - Unrealized Loss Included in Accumulated Other Comprehensive (Loss) Income before Income Taxes (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Qualified |  |
Amounts in accumulated other comprehensive income (loss) before income taxes |  |
Net loss | $ 540 | $ 520
Net prior service cost | 3 | 4
Total | 543 | 524
Non-Qualified |  |
Amounts in accumulated other comprehensive income (loss) before income taxes |  |
Net loss | 65 | 57
Net prior service cost | 0 | 0
Total | $ 65 | $ 57

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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: 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 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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