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EMPLOYEE BENEFIT PLANS (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) noncallable_bond | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assumed health care cost trend rate | 6.25% |  |
Ultimate trend rate | 4.50% |  |
Assumed return | 6.00% |  |
10 year actual rate of return | 5.30% |  |
Number of Aa-grade non-callable bonds used to develop the yield curve for rate used (noncallable bond) | noncallable_bond | 858 |  |
Total fair value of trust other net liabilities | $ 10 | $ 11 |
Retirement savings plan expense | $ 158 | $ 144 | $ 133
Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
10 year actual rate of return | 6.00% | 6.10% | 5.50%
Company contributions | $ 336 | $ 339 |
Expected employer contribution next year | 327 |  |
Long-term Disability Trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Company contributions | 31 |  |
Expected employer contribution next year | 31 |  |
PBOP Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Company contributions | $ 5 | $ 26 |

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- Definition Curve used to discount pension benefits and other benefits that is based on market data from non callable bonds + References No definition available. + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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