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Pension and Other Postretirement Benefits (Tables)
 3 Months Ended
Dec. 31, 2018
Retirement Benefits [Abstract]  
Schedule of Pension and Other Postretirement Benefits
 
 
 
 
 
 
 
 

 
Pension Benefits
 
U.S. Plans
 
Non-U.S. Plans
 
Three Months Ended
December 31,
 
Three Months Ended
December 31,
 
2018
 
2017
 
2018
 
2017
 
(in millions)
Service cost
$
—

 
$
—

 
$
1

 
$
1

Interest cost
8

 
8

 
3

 
3

Expected return on plan assets
(18
)
 
(17
)
 
(4
)
 
(5
)
Total net periodic benefit cost (income)
$
(10
)
 
$
(9
)
 
$
—

 
$
(1
)