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Pension & Postretirement Expenses
6 Months Ended
Mar. 31, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Pension And Postretirement Plan Expenses
Total periodic pension and postretirement expense is summarized below (in millions):
 
Three Months Ended
March 31,
 
Six Months Ended
March 31,
 
2014

 
2015

 
2014

 
2015

Service cost
$
23

 
27

 
47

 
54

Interest cost
60

 
61

 
122

 
121

Expected return on plan assets
(86
)
 
(92
)
 
(172
)
 
(184
)
Net amortization
37

 
42

 
73

 
85

Total
$
34

 
38

 
70

 
76