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Employee Retirement Plans - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |
ABO | $ 21,000,000 | $ 22,000,000 |
Fair value of plan assets | 18,000,000 | 16,000,000 |
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contribution made to Pension Plan | 19,000,000 | 15,000,000 |
Projected benefit obligations of unfunded and non qualified supplemental executive retirement plans | 623,000,000 | 633,000,000 | $ 870,000,000
Costs associated with the plans | (4,000,000) | (1,000,000) | 8,000,000
Payments for defined benefit retirement plan | 36,000,000 | 34,000,000 |
Supplemental Employee Retirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligations of unfunded and non qualified supplemental executive retirement plans | 34,000,000 | 44,000,000 |
Costs associated with the plans | 0 | 0 |
Payments for defined benefit retirement plan | 0 | 0 | 12,000,000
Fair value of pension and other postretirement benefit contributions | 26,000,000 | 31,000,000 |
U.S. | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contribution made to Pension Plan | 18,000,000 | $ 14,000,000 | $ 13,000,000
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | $ 22,000,000 |  |

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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for 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 (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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