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Postretirement Plans | 12 Months Ended
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Sep. 30, 2019
Postemployment Benefits [Abstract] |
Postretirement Plans | POSTRETIREMENT PLANS The Company sponsors unfunded postretirement benefit plans (primarily health care) for certain U.S. retirees and their dependents. The components of net postretirement benefits expense for the years ended September 30 follow:
| 2017 |  |  | 2018 |  |  | 2019 |
Service cost | $ | 1 |  |  | 1 |  |  | 1 |
Interest cost | 6 |  |  | 6 |  |  | 5 |
Net amortization | (19 | ) |  | (19 | ) |  | (18 | )
Net postretirement expense | $ | (12 | ) |  | (12 | ) |  | (12 | )
Details of the changes in actuarial present value of accumulated postretirement benefit obligations follow:
| 2018 |  |  | 2019 |
Benefit obligation, beginning | $ | 174 |  |  | 149 |
Service cost | 1 |  |  | 1 |
Interest cost | 6 |  |  | 5 |
Actuarial (gain) loss | (19 | ) |  | 5 |
Benefits paid | (13 | ) |  | (13 | )
Benefit obligation, ending (recognized in balance sheet) | $ | 149 |  |  | 147 |
As of September 30, 2019 there were $118 of deferred actuarial gains in accumulated other comprehensive income, of which approximately $13 will be amortized into earnings in 2020. The discount rates used to measure the benefit obligation as of September 30, 2019, 2018 and 2017 were 2.99 percent, 4.08 percent and 3.45 percent, respectively. The health care cost trend rate used for 2020 is assumed to be 7.0 percent initially and was assumed to be 7.2 percent in 2019, declining to 5.0 percent over the subsequent nine years. A one percentage point increase or decrease in the health care cost trend rate assumption for either year would have an inconsequential impact on postretirement benefits expense and the benefit obligation. The Company estimates that future health care benefit payments will be approximately $12 per year for 2020 through 2024, and $49 in total over the five years 2025 through 2029.

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 + Details
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