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Retirement 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, 2023 | Sep. 30, 2022
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 4,454 | $ 4,533
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 | $ 727 | $ 621
Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 1,544 | 1,635
Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 126 | 130
Measured at NAV |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 2,057 | 2,147
U.S. equities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 1,024 | $ 1,044
Percentage of defined benefit plan assets | 23.00% | 23.00%
U.S. equities | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 396 | $ 405
U.S. equities | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 9 | 6
U.S. equities | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 0 |
U.S. equities | Measured at NAV |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 619 | 633
International equities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 327 | $ 358
Percentage of defined benefit plan assets | 7.00% | 8.00%
International equities | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 210 | $ 225
International equities | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 14 | 10
International equities | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 0 |
International equities | Measured at NAV |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 103 | 123
Emerging market equities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 119 | $ 125
Percentage of defined benefit plan assets | 3.00% | 3.00%
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 |
Emerging market equities | Measured at NAV |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 118 | 124
Corporate bonds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 1,851 | $ 2,002
Percentage of defined benefit plan assets | 42.00% | 44.00%
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 | 1,008 | 1,143
Corporate bonds | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 0 |
Corporate bonds | Measured at NAV |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 843 | 859
Government bonds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 629 | $ 620
Percentage of defined benefit plan assets | 14.00% | 14.00%
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 | 505 | 468
Government bonds | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 0 |
Government bonds | Measured at NAV |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 124 | 152
Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 504 | $ 384
Percentage of defined benefit plan assets | 11.00% | 8.00%
Other | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 121 | $ (9)
Other | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 7 | 7
Other | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 126 | 130
Other | Measured at NAV |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 250 | $ 256

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