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Retirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2014
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Components Of Net Periodic Benefit Cost
The following table presents the components of the net periodic benefit cost (benefit) for Ameren’s pension and postretirement benefit plans for the three and nine months ended September 30, 2014, and 2013:
  
Pension Benefits
 
Postretirement Benefits
 
 
Three Months
 
Nine Months
 
Three Months
 
Nine Months
 
  
2014
 
2013
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
 
Service cost
$
20

 
$
23

 
$
60

 
$
69

 
$
5

 
$
6

 
$
14

 
$
17

 
Interest cost
46

 
40

 
137

 
121

 
12

 
11

 
37

 
34

 
Expected return on plan assets
(58
)
 
(54
)
 
(172
)
 
(162
)
 
(16
)
 
(16
)
 
(48
)
 
(47
)
 
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service cost (benefit)
(1
)
 
(1
)
 
(1
)
 
(3
)
 
(2
)
 
(1
)
 
(4
)
 
(3
)
 
Actuarial loss (gain)
13

 
23

 
37

 
69

 
(2
)
 
2

 
(5
)
 
6

 
Net periodic benefit cost (benefit)(a)
$
20

 
$
31

 
$
61

 
$
94

 
$
(3
)
 
$
2

 
$
(6
)
 
$
7

 
(a)
Includes $2 million and $8 million in total net costs for pension benefits for the three and nine months ended September 30, 2013, respectively, which were included in “Loss from discontinued operations, net of taxes” on Ameren’s consolidated statement of income. Includes less than $1 million in total net costs for postretirement benefits for both the three and nine months ended September 30, 2013, which were included in “Loss from discontinued operations, net of taxes” on Ameren’s consolidated statement of income.
Summary Of Benefit Plan Costs Incurred
Ameren Missouri and Ameren Illinois are responsible for their respective shares of Ameren’s pension and postretirement costs. The following table presents the pension costs and the postretirement benefit costs incurred for the three and nine months ended September 30, 2014, and 2013:
  
Pension Benefits
 
Postretirement Benefits
 
 
Three Months
 
Nine Months
 
Three Months
 
Nine Months
 
  
2014
 
2013
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
 
Ameren Missouri
$
13

 
$
18

 
$
38

 
$
54

 
$ (a)

 
$
2

 
$
2

 
$
7

 
Ameren Illinois
7

 
10

 
22

 
31

 
(3
)
 
(a)

 
(7
)
 
(a)

 
Other(b)
(a)

 
3

 
1

 
9

 
(a)

 
(a)

 
(1
)
 
(a)

 
Ameren(c)
$
20

 
$
31

 
$
61

 
$
94

 
$
(3
)
 
$
2

 
$
(6
)
 
$
7

 
(a)
Less than $1 million.
(b)
Includes $2 million and $8 million in total net costs for pension benefits for the three and nine months ended September 30, 2013, respectively, which were included in “Loss from discontinued operations, net of taxes” on Ameren’s consolidated statement of income. Includes less than $1 million in total net costs for postretirement benefits for both the three and nine months ended September 30, 2013, which were included in “Loss from discontinued operations, net of taxes” on Ameren’s consolidated statement of income.
(c)
Includes amounts for Ameren registrants and nonregistrant subsidiaries.