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PENSION AND POSTRETIREMENT PLANS - Schedule of Fair Values of Defined Benefit Plan Assets Organized by Asset Class and Fair Value Hierarchy of ASC 820 (Details) - Pension Plan - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 4,705 | $ 4,855
Percentage of defined benefit plan assets | 100.00% | 100.00%
Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 552 | $ 605
Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 2,092 | 2,149
Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 143 | 132
Measured at NAV |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 1,918 | 1,969
U.S. equities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 837 | $ 875
Percentage of defined benefit plan assets | 18.00% | 18.00%
U.S. equities | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 246 | $ 245
U.S. equities | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 10 | 10
U.S. equities | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 0 | 0
U.S. equities | Measured at NAV |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 581 | 620
International equities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 291 | $ 231
Percentage of defined benefit plan assets | 6.00% | 5.00%
International equities | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 169 | $ 154
International equities | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 11 | 12
International equities | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 0 | 0
International equities | Measured at NAV |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 111 | 65
Emerging market equities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 95 | $ 102
Percentage of defined benefit plan assets | 2.00% | 2.00%
Emerging market equities | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 0 | $ 0
Emerging market equities | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 1 | 1
Emerging market equities | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 0 | 0
Emerging market equities | Measured at NAV |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 94 | 101
Corporate bonds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 2,005 | $ 2,100
Percentage of defined benefit plan assets | 43.00% | 43.00%
Corporate bonds | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 0 | $ 0
Corporate bonds | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 1,170 | 1,221
Corporate bonds | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 0 | 0
Corporate bonds | Measured at NAV |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 835 | 879
Government bonds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 1,005 | $ 1,012
Percentage of defined benefit plan assets | 21.00% | 21.00%
Government bonds | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 0 | $ 0
Government bonds | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 899 | 904
Government bonds | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 0 | 0
Government bonds | Measured at NAV |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 106 | 108
Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 472 | $ 535
Percentage of defined benefit plan assets | 10.00% | 11.00%
Other | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 137 | $ 206
Other | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 1 | 1
Other | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 143 | 132
Other | Measured at NAV |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 191 | $ 196

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