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Retirement Benefit Liabilities (Tables)
 9 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Summary of retirement benefit liabilities
Retirement benefit liabilities consisted of the following (in millions):
 
June 30,
2019
 
September 30,
2018
Retiree medical liability
$
79

 
$
86

Pension liability
163

 
182

Other
15

 
13

Subtotal
257

 
281

Less: current portion (included in compensation and benefits, Note 16)
(19
)
 
(19
)
Retirement benefits
$
238

 
$
262
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 June 30 are as follows (in millions):
 
2019
 
2018
 
Pension
 
Retiree Medical
 
Pension
 
Retiree Medical
Interest cost
$
13

 
$
1

 
$
14

 
$
1

Assumed return on plan assets
(24
)
 
—

 
(25
)
 
—

Amortization of prior service costs
—

 
(9
)
 
—

 
(9
)
Recognized actuarial loss
6

 
4

 
7

 
5

Total income
$
(5
)
 
$
(4
)
 
$
(4
)
 
$
(3
)

The components of net periodic pension and retiree medical income included in continuing operations for the nine months ended June 30 are as follows (in millions):
 
2019
 
2018
 
Pension
 
Retiree Medical
 
Pension
 
Retiree Medical
Interest cost
$
40

 
$
2

 
$
41

 
$
2

Assumed return on plan assets
(73
)
 
—

 
(74
)
 
—

Amortization of prior service costs
—

 
(26
)
 
—

 
(26
)
Recognized actuarial loss
17

 
12

 
21

 
13

Total income
$
(16
)
 
$
(12
)
 
$
(12
)
 
$
(11
)