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Retirement Benefit Liabilities
 6 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Retirement Benefit Liabilities 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


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
)


For the three months ended March 31, 2020 and 2019, the non-service cost components of the net periodic pension and Other Post-Employment Benefits ("OPEB") income were $11 million and $10 million, respectively, and are presented in Other income, net. For the six months ended March 31, 2020 and 2019, the non-service cost components of the net periodic pension and OPEB income were $21 million and $19 million, respectively, and are presented in Other income, net.