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EMPLOYEE BENEFIT PLANS (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Sep. 30, 2022
Other Postretirement Benefits Plan | Retirement Income Plans | UNITED STATES |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate used for benefit obligation remeasurement |  | 5.00% |
Net unrealized loss in AOCI, net of tax |  | $ 126 |
Net unrealized loss in AOCI, before taxes |  | 165 |
Net periodic benefit cost |  | 5 | $ 4
Retirement plan contributions |  | 2 | 2
Other Postretirement Benefits Plan | Retirement Income Plans | UNITED STATES | Forecast |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
One-time non-cash before tax settlement charge | $ 165 |  |
Postretirement Health Coverage | Retirement Health Care |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net periodic benefit cost |  | $ 0 | $ 0

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation 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 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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