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Compensation and Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2013
Pension Plans
  
Defined Benefit Plan Disclosure [Line Items]  
Expense Components for Plans
The following were components of pension expense:
 
Three Months Ended September 30,
 
2013
 
2012
(in millions)
Midwest Generation
 
Other EME Sub- sidiaries1
 
EME
 
Midwest Generation
 
Other EME Sub- sidiaries1
 
EME
Service cost
$
3

 
$
1

 
$
4

 
$
3

 
$
1

 
$
4

Interest cost
2

 
1

 
3

 
2

 
1

 
3

Expected return on plan assets
(3
)
 
(1
)
 
(4
)
 
(2
)
 
(1
)
 
(3
)
Net amortization
1

 
—

 
1

 
1

 
1

 
2

Total expense
$
3

 
$
1

 
$
4

 
$
4

 
$
2

 
$
6

1 
Excludes Homer City.
 
Nine Months Ended September 30,
 
2013
 
2012
(in millions)
Midwest Generation
 
Other EME Sub- sidiaries1
 
EME
 
Midwest Generation
 
Other EME Sub- sidiaries1
 
EME
Service cost
$
9

 
$
2

 
$
11

 
$
10

 
$
2

 
$
12

Interest cost
6

 
3

 
9

 
6

 
3

 
9

Expected return on plan assets
(8
)
 
(2
)
 
(10
)
 
(7
)
 
(2
)
 
(9
)
Net amortization
2

 
2

 
4

 
2

 
3

 
5

Total expense
$
9

 
$
5

 
$
14

 
$
11

 
$
6

 
$
17

1 
Excludes Homer City.
Postretirement Benefits Other Than Pensions
  
Defined Benefit Plan Disclosure [Line Items]  
Expense Components for Plans
The following were components of postretirement benefits expense:
 
Three Months Ended September 30,
 
2013
 
2012
(in millions)
Midwest Generation
 
Other EME Sub- sidiaries1
 
EME
 
Midwest Generation
 
Other EME Sub- sidiaries1
 
EME
Service cost
$
0.4

 
$
0.2

 
$
0.6

 
$
0.3

 
$
0.4

 
$
0.7

Interest cost
0.6

 
0.4

 
1.0

 
0.7

 
0.4

 
1.1

Net amortization
0.4

 
(0.2
)
 
0.2

 
0.5

 
(0.2
)
 
0.3

Total expense
$
1.4

 
$
0.4

 
$
1.8

 
$
1.5

 
$
0.6

 
$
2.1

1 
Excludes Homer City.
 
Nine Months Ended September 30,
 
2013
 
2012
(in millions)
Midwest Generation
 
Other EME Sub- sidiaries1
 
EME
 
Midwest Generation
 
Other EME Sub- sidiaries1
 
EME
Service cost
$
1.0

 
$
0.8

 
$
1.8

 
$
1.1

 
$
0.8

 
$
1.9

Interest cost
1.8

 
1.2

 
3.0

 
2.1

 
1.2

 
3.3

Net amortization
1.2

 
(0.4
)
 
0.8

 
1.3

 
(0.3
)
 
1.0

Total expense
$
4.0

 
$
1.6

 
$
5.6

 
$
4.5

 
$
1.7

 
$
6.2

1 
Excludes Homer City.