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Retirement Benefit Liabilities (Tables)
 6 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Summary of Retirement Benefit Liabilities
Retirement benefit liabilities consisted of the following (in millions):
 
March 31,
2020
 
September 30,
2019
Retiree medical liability
$
63

 
$
67

Pension liability
255

 
271

Other
14

 
14

Subtotal
332

 
352

Less: current portion (included in compensation and benefits, Note 15)
(17
)
 
(16
)
Retirement benefits
$
315

 
$
336
Components of Net Periodic Pension and Retiree Medical Income The components of net periodic pension and retiree medical income included in continuing operations for the three months ended March 31 are as follows (in millions):
 
2020
 
2019
 
Pension
 
Retiree Medical
 
Pension
 
Retiree Medical
Interest cost
$
10

 
$
1

 
$
14

 
$
—

Assumed return on plan assets
(24
)
 
—

 
(25
)
 
—

Amortization of prior service benefit
—

 
(9
)
 
—

 
(8
)
Recognized actuarial loss
8

 
3

 
5

 
4

Total income
$
(6
)
 
$
(5
)
 
$
(6
)
 
$
(4
)


The components of net periodic pension and retiree medical income included in continuing operations for the six months ended March 31 are as follows (in millions):
 
2020
 
2019
 
Pension
 
Retiree Medical
 
Pension
 
Retiree Medical
Interest cost
$
21

 
$
1

 
$
27

 
$
1

Assumed return on plan assets
(48
)
 
—

 
(49
)
 
—

Amortization of prior service benefit
—

 
(18
)
 
—

 
(17
)
Recognized actuarial loss
16

 
7

 
11

 
8

Total income
$
(11
)
 
$
(10
)
 
$
(11
)
 
$
(8
)