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Retirement Benefit Liabilities (Tables)
 3 Months Ended
Dec. 31, 2018
Retirement Benefits [Abstract]  
Summary of 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
Components of net periodic pension and retiree medical expense
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.