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Postretirement Plans
 12 Months Ended
Sep. 30, 2018
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:
 
2016

 
2017

 
2018

Service cost
$
1

 
1

 
1

Interest cost
8

 
6

 
6

Net amortization
(21
)
 
(19
)
 
(19
)
     Net postretirement expense
$
(12
)
 
(12
)
 
(12
)


Details of the changes in actuarial present value of accumulated postretirement benefit obligations follow:
 
2017

 
2018

Benefit obligation, beginning
$
206

 
174

     Service cost
1

 
1

     Interest cost
6

 
6

     Actuarial (gain) loss
(24
)
 
(19
)
     Benefits paid
(13
)
 
(13
)
     Divestitures
(2
)
 
—

Benefit obligation, ending (recognized in balance sheet)
$
174

 
149



As of September 30, 2018 there were $141 of deferred actuarial gains in accumulated other comprehensive income, of which approximately $18 will be amortized into earnings in 2019. The discount rates used to measure the benefit obligation as of September 30, 2018, 2017 and 2016 were 4.08 percent, 3.45 percent and 3.10 percent, respectively. The health care cost trend rate used for 2019 is assumed to be 7.2 percent initially and was assumed to be 7.5 percent in 2018, declining to 5.0 percent over the subsequent 10 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 $13 per year for 2019 through 2023, and $54 in total over the five years 2024 through 2028.