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EMPLOYEE BENEFIT PLANS - FUNDED STATUS (Details) - Qualified Defined Benefit [Member] - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Benefit obligation |  |  |
Beginning of year | $ 2,079 | $ 2,758 |
Service cost | 29 | 45 | $ 52
Actuarial (gain) loss | 83 | (628) |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (116) | (172) |
End of year | 2,183 | 2,079 | 2,758
Defined Benefit Plan Service Cost, including early-out expense | 29 | 46 |
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits | 0 | 9 |
Defined Benefit Interest Cost, PBO | 108 | 66 |
Plan assets at fair value |  |  |
Beginning of year | 1,894 | 2,695 |
Actual return on plan assets | 245 | (629) |
Defined Benefit Plan, Plan Assets, Benefits Paid | (116) | (172) |
End of year | 2,023 | 1,894 | $ 2,695
Funded status (unfunded) | $ (160) | $ (185) |
Percent funded | 93.00% | 91.00% |
Accumulated benefit obligation | $ 2,100 | $ 2,000 |
Defined Benefit Plan, Plan Assets, Benefits Paid | $ 116 | $ 172 |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480266/715-60-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(6) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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