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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) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 4,855 | $ 4,454
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 | $ 605 | $ 727
Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 2,149 | 1,544
Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 132 | 126
Measured at NAV |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 1,969 | 2,057
U.S. equities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 875 | $ 1,024
Percentage of defined benefit plan assets | 18.00% | 23.00%
U.S. equities | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 245 | $ 396
U.S. equities | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 10 | 9
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 | 620 | 619
International equities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 231 | $ 327
Percentage of defined benefit plan assets | 5.00% | 7.00%
International equities | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 154 | $ 210
International equities | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 12 | 14
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 | 65 | 103
Emerging market equities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 102 | $ 119
Percentage of defined benefit plan assets | 2.00% | 3.00%
Emerging market equities | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets |  | $ 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 | 101 | 118
Corporate bonds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 2,100 | $ 1,851
Percentage of defined benefit plan assets | 43.00% | 42.00%
Corporate bonds | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets |  | $ 0
Corporate bonds | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 1,221 | 1,008
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 | 879 | 843
Government bonds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 1,012 | $ 629
Percentage of defined benefit plan assets | 21.00% | 14.00%
Government bonds | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets |  | $ 0
Government bonds | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 904 | 505
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 | 108 | 124
Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 535 | $ 504
Percentage of defined benefit plan assets | 11.00% | 11.00%
Other | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 206 | $ 121
Other | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 1 | 7
Other | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 132 | 126
Other | Measured at NAV |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 196 | $ 250

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