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Defined Benefit Pension and Other Postretirement Plans (Tables) | 6 Months Ended
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Mar. 31, 2022
Retirement Benefits [Abstract] |
Components of Net Periodic Pension Cost | Net periodic pension cost includes the following components:
Three Months Ended March 31, |  | 2022 |  | 2021
Service cost |  | $ | 4 |  |  | $ | 3 |
Interest cost |  | 7 |  |  | 6 |
Expected return on assets |  | (13) |  |  | (10) |
Amortization of: |  |  |  |
Actuarial loss |  | 2 |  |  | 3 |
Net cost |  | $ | — |  |  | $ | 2 |
Six Months Ended March 31, |  | 2022 |  | 2021
Service cost |  | $ | 8 |  |  | $ | 6 |
Interest cost |  | 13 |  |  | 11 |
Expected return on assets |  | (25) |  |  | (20) |
Amortization of: |  |  |  |
Actuarial loss |  | 4 |  |  | 7 |
Net cost |  | $ | — |  |  | $ | 4 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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