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Pension and Postretirement Plans
 6 Months Ended
Mar. 31, 2018
Defined Benefit Plan [Abstract]  
Pension and Postretirement Plans
Pension and Postretirement Plans

The components of the Company’s net periodic benefit costs from continuing operations associated with its defined benefit pension and postretirement plans are shown in the tables below in accordance with ASC 715, "Compensation – Retirement Benefits" (in millions):
 
U.S. Pension Plans
 
Three Months Ended
March 31,
 
Six Months Ended
March 31,
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
Service cost
$
3

 
$
4

 
$
7

 
$
9

Interest cost
27

 
29

 
53

 
57

Expected return on plan assets
(57
)
 
(58
)
 
(114
)
 
(117
)
Net actuarial gain
—

 
(18
)
 
—

 
(135
)
Settlement gain
—

 
(1
)
 
—

 
(9
)
Net periodic benefit credit
$
(27
)
 
$
(44
)
 
$
(54
)
 
$
(195
)


 
Non-U.S. Pension Plans
 
Three Months Ended
March 31,
 
Six Months Ended
March 31,
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
Service cost
$
6

 
$
8

 
$
12

 
$
16

Interest cost
15

 
11

 
29

 
23

Expected return on plan assets
(29
)
 
(22
)
 
(58
)
 
(45
)
Net periodic benefit credit
$
(8
)
 
$
(3
)
 
$
(17
)
 
$
(6
)

 
Postretirement Benefits
 
Three Months Ended
March 31,
 
Six Months Ended
March 31,
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
Service cost
$
1

 
$
—

 
$
1

 
$
1

Interest cost
1

 
2

 
3

 
3

Expected return on plan assets
(3
)
 
(2
)
 
(5
)
 
(5
)
Net periodic benefit credit
$
(1
)
 
$
—

 
$
(1
)
 
$
(1
)

During the three and six months ended March 31, 2017, the amount of lump sum payouts triggered a remeasurement event for certain U.S. pension plans resulting in the recognition of net actuarial gains of $18 million and $135 million, respectively.