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Retirement Benefit Liabilities
 9 Months Ended
Jun. 30, 2017
Retirement Benefits [Abstract]  
Retirement Benefit Liabilities
Retirement Benefit Liabilities
Retirement benefit liabilities consisted of the following (in millions):
 
June 30,
2017
 
September 30,
2016
Retiree medical liability
$
432

 
$
447

Pension liability
261

 
283

Other
13

 
13

Subtotal
706

 
743

Less: current portion (included in compensation and benefits, Note 15)
(39
)
 
(40
)
Retirement benefits
$
667

 
$
703


The components of net periodic pension and retiree medical expense included in continuing operations for the three months ended June 30 are as follows (in millions):
 
2017
 
2016
 
Pension
 
Retiree Medical
 
Pension
 
Retiree Medical
Interest cost
$
13

 
$
4

 
$
16

 
$
4

Assumed return on plan assets
(24
)
 
—

 
(24
)
 
—

Amortization of prior service costs
—

 
(1
)
 
—

 
—

Recognized actuarial loss
8

 
4

 
6

 
3

Total expense (income)
$
(3
)
 
$
7

 
$
(2
)
 
$
7



The components of net periodic pension and retiree medical expense included in continuing operations for the nine months ended June 30 are as follows (in millions):
 
2017
 
2016
 
Pension
 
Retiree Medical
 
Pension
 
Retiree Medical
Interest cost
$
39

 
$
11

 
$
49

 
$
13

Assumed return on plan assets
(71
)
 
—

 
(74
)
 
—

Amortization of prior service costs
—

 
(2
)
 
—

 
—

Recognized actuarial loss
23

 
11

 
18

 
9

Total expense (income)
$
(9
)
 
$
20

 
$
(7
)
 
$
22