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Employee Retirement Plans - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected amortization of net actuarial losses | $ 0 |  |
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected amortization of net actuarial losses | 15 |  |
ABO for the pension plans | 687 | $ 659 |
Contribution made to Pension Plan | 13 | 12 |
Projected benefit obligations of unfunded and non qualified supplemental executive retirement plans | 782 | 750 | $ 669
Net actuarial loss | 24 | 26 |
Fair value of pension and other postretirement benefit contributions | 0 | 0 |
Costs associated with the plans | 11 | 9 | 16
Supplemental Employee Retirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligations of unfunded and non qualified supplemental executive retirement plans | 59 | 53 |
Net actuarial loss | 12 | 9 |
Fair value of pension and other postretirement benefit contributions | 35 | 34 |
Costs associated with the plans | 0 | 0 |
U.S. | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contribution made to Pension Plan | $ 13 | $ 12 | $ 15

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 + Details
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