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Defined Benefit Pension and Other Postretirement Plans (Tables) | 9 Months Ended
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Jun. 30, 2021
Retirement Benefits [Abstract] |
Components of Net Periodic Pension Expense and Other Postretirement Benefit Costs | Net periodic pension cost includes the following components:
|  | Pension Benefits
Three Months Ended June 30, |  | 2021 |  | 2020
Service cost |  | $ | 3 |  |  | $ | 3 |
Interest cost |  | 5 |  |  | 6 |
Expected return on assets |  | (10) |  |  | (10) |
Amortization of: |  |  |  |
Actuarial loss |  | 4 |  |  | 4 |
Net cost |  | $ | 2 |  |  | $ | 3 |
Nine Months Ended June 30, |  | 2021 |  | 2020
Service cost |  | $ | 9 |  |  | $ | 9 |
Interest cost |  | 16 |  |  | 18 |
Expected return on assets |  | (30) |  |  | (29) |
Curtailment gain |  | — |  |  | (1) |
Amortization of: |  |  |  |
Actuarial loss |  | 11 |  |  | 11 |
Net cost |  | $ | 6 |  |  | $ | 8 |

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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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