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PENSION AND OTHER POSTRETIREMENT BENEFITS - Other Postretirement Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Other Postretirement Benefits |  |
Assumed health care cost trend rate |  |
Health care cost trend rate assumed for next year | 7.00% | 7.50%
Rate that the cost trend rate gradually declines to | 5.00% | 5.00%
Year that the rate reaches the rate it is assumed to remain at | 2031 | 2031
Without Impact of Medicare Subsidy |  |
Assumed health care cost trend rate |  |
2024 | $ 13 |
2025 | 12 |
2026 | 12 |
2027 | 11 |
2028 | 11 |
2029-2033 | 46 |
Net of Medicare Subsidy |  |
Assumed health care cost trend rate |  |
2024 | 12 |
2025 | 12 |
2026 | 11 |
2027 | 11 |
2028 | 10 |
2029-2033 | $ 44 |

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- Definition Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of benefit for defined benefit plan expected to be paid in fifth fiscal year following current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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