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Leases (Tables)
 12 Months Ended
Sep. 30, 2018
Leases [Abstract]  
Future Minimum Capital and Operating Lease Payments and Related Present Value of Capital Lease Payments
Future minimum capital and operating lease payments and the related present value of capital lease payments at September 30, 2018 were as follows (in millions):
 
Capital
Leases
 
Operating
Leases
2019
$
5

 
$
348

2020
6

 
284

2021
6

 
208

2022
15

 
152

2023
2

 
111

After 2023
9

 
97

Total minimum lease payments
43

 
$
1,200

Interest
(7
)
 
 
Present value of net minimum lease payments
$
36