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Retirement Benefit Liabilities
 3 Months Ended
Dec. 31, 2018
Retirement Benefits [Abstract]  
Retirement Benefit Liabilities
Retirement Benefit Liabilities
Retirement benefit liabilities consisted of the following (in millions):
 
December 31,
2018
 
September 30,
2018
Retiree medical liability
$
84

 
$
86

Pension liability
176

 
182

Other
14

 
13

Subtotal
274

 
281

Less: current portion (included in compensation and benefits, Note 16)
(20
)
 
(19
)
Retirement benefits
$
254

 
$
262


The components of net periodic pension and retiree medical expense included in continuing operations for the three months ended December 31 are as follows (in millions):
 
2018
 
2017
 
Pension
 
Retiree Medical
 
Pension
 
Retiree Medical
Interest cost
$
13

 
$
1

 
$
13

 
$
1

Assumed return on plan assets
(24
)
 
—

 
(24
)
 
—

Amortization of prior service costs
—

 
(9
)
 
—

 
(9
)
Recognized actuarial loss
6

 
4

 
7

 
4

Total expense (income)
$
(5
)
 
$
(4
)
 
$
(4
)
 
$
(4
)

For the three months ended December 31, 2018 and 2017, the non-service cost components of the net periodic pension and Other Post-Employment Benefits ("OPEB") income was $9 million and $8 million, respectively, and are presented in other income. We used the practical expedient for retrospective presentation of the 2017 other expense components in this disclosure. Refer to Note 3 for additional details on the adoption of ASU 2017-07.