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Retirement Benefits (Tables)
6 Months Ended
Jun. 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 six months ended June 30, 2014, and 2013:
  
Pension Benefits
 
Postretirement Benefits
 
 
Three Months
 
Six Months
 
Three Months
 
Six Months
 
  
2014
 
2013
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
 
Service cost
$
19

 
$
22

 
$
40

 
$
46

 
$
4

 
$
5

 
$
9

 
$
11

 
Interest cost
42

 
41

 
91

 
81

 
12

 
11

 
25

 
23

 
Expected return on plan assets
(57
)
 
(54
)
 
(114
)
 
(108
)
 
(16
)
 
(15
)
 
(32
)
 
(31
)
 
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service cost (benefit)

 
(1
)
 

 
(2
)
 
(1
)
 
(1
)
 
(2
)
 
(2
)
 
Actuarial loss (gain)
12

 
24

 
24

 
46

 
(2
)
 
2

 
(3
)
 
4

 
Net periodic benefit cost (benefit)
$
16

 
$
32

 (a)

$
41

 
$
63

 (a)

$
(3
)
 
$
2

 (a)

$
(3
)
 
$
5

  (a)  
(a)
The net periodic benefit cost includes $3 million and $6 million in total net costs for pension benefits, for the three and six months ended June 30, 2013, respectively, which were included in “Loss from discontinued operations, net of taxes” on Ameren’s consolidated statement of income (loss). The net periodic benefit cost includes $1 million and $- million in total net costs for postretirement benefits, for the three and six months ended June 30, 2013, respectively, which were included in “Loss from discontinued operations, net of taxes” on Ameren’s consolidated statement of income (loss).
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 six months ended June 30, 2014, and 2013:
  
Pension Benefits
 
Postretirement Benefits
 
 
Three Months
 
Six Months
 
Three Months
 
Six Months
 
  
2014
 
2013
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
 
Ameren Missouri
$
8

 
$
18

 
$
25

 
$
36

 
$
1

 
$
2

 
$
2

 
$
5

 
Ameren Illinois
7

 
11

 
15

 
21

 
(3
)
 
(1
)
 
(4
)
 

 
Other
1

 
3

(b) 
1

 
6

(b) 
(1
)
 
1

(b) 
(1
)
 

(b) 
Ameren(a)
$
16

 
$
32

 
$
41

 
$
63

 
$
(3
)
 
$
2

 
$
(3
)
 
$
5

 
(a)
Includes amounts for Ameren registrants and nonregistrant subsidiaries.
(b)
The net periodic benefit cost includes $3 million and $6 million in total net costs for pension benefits, for the three and six months ended June 30, 2013, respectively, which were included in “Loss from discontinued operations, net of taxes” on Ameren’s consolidated statement of income (loss). The net periodic benefit cost includes $1 million and $- million in total net costs for postretirement benefits, for the three and six months ended June 30, 2013, respectively, which were included in “Loss from discontinued operations, net of taxes” on Ameren’s consolidated statement of income (loss).