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Retirement Benefit Liabilities
 3 Months Ended
Dec. 31, 2017
Retirement Benefits [Abstract]  
Retirement Benefit Liabilities
Retirement Benefit Liabilities
Retirement benefit liabilities consisted of the following (in millions):
 
December 31,
2017
 
September 30,
2017
Retiree medical liability
$
95

 
$
104

Pension liability
212

 
219

Other
15

 
15

Subtotal
322

 
338

Less: current portion (included in compensation and benefits, Note 16)
(24
)
 
(24
)
Retirement benefits
$
298

 
$
314


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):
 
2017
 
2016
 
Pension
 
Retiree Medical
 
Pension
 
Retiree Medical
Interest cost
$
13

 
$
1

 
$
13

 
$
4

Assumed return on plan assets
(24
)
 
—

 
(23
)
 
—

Amortization of prior service costs
—

 
(9
)
 
—

 
(1
)
Recognized actuarial loss
7

 
4

 
7

 
4

Total expense (income)
$
(4
)
 
$
(4
)
 
$
(3
)
 
$
7