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Compensation and Benefit Plans
 6 Months Ended
Jun. 30, 2013
Compensation and Retirement Disclosure [Abstract]  
Compensation and Benefit Plans
Compensation and Benefit Plans (EME and Midwest Generation, except as noted)
Pension Plans and Postretirement Benefits Other than Pensions
Pension Plans
During the six months ended June 30, 2013, EME and Midwest Generation made contributions of $7 million and $3 million, respectively, and during the remainder of 2013, expect to make $8 million and $5 million of additional contributions, respectively.
The following were components of pension expense:
 
Three Months Ended June 30,
 
2013
 
2012
(in millions)
Midwest Generation
 
Other EME Sub- sidiaries1
 
EME
 
Midwest Generation
 
Other EME Sub- sidiaries1
 
EME
Service cost
$
2

 
$
—

 
$
2

 
$
3

 
$
1

 
$
4

Interest cost
2

 
1

 
3

 
2

 
1

 
3

Expected return on plan assets
(2
)
 
(1
)
 
(3
)
 
(3
)
 
—

 
(3
)
Net amortization
—

 
2

 
2

 
1

 
1

 
2

Total expense
$
2

 
$
2

 
$
4

 
$
3

 
$
3

 
$
6

1 
Excludes Homer City.
 
Six Months Ended June 30,
 
2013
 
2012
(in millions)
Midwest Generation
 
Other EME Sub- sidiaries1
 
EME
 
Midwest Generation
 
Other EME Sub- sidiaries1
 
EME
Service cost
$
6

 
$
1

 
$
7

 
$
7

 
$
1

 
$
8

Interest cost
4

 
2

 
6

 
4

 
2

 
6

Expected return on plan assets
(5
)
 
(1
)
 
(6
)
 
(5
)
 
(1
)
 
(6
)
Net amortization
1

 
2

 
3

 
1

 
2

 
3

Total expense
$
6

 
$
4

 
$
10

 
$
7

 
$
4

 
$
11

1 
Excludes Homer City.
Postretirement Benefits Other Than Pensions
During the six months ended June 30, 2013, EME and Midwest Generation made no contributions and during the remainder of 2013 expect to make $2 million and $1 million of additional contributions, respectively.
The following were components of postretirement benefits expense:
 
Three Months Ended June 30,
 
2013
 
2012
(in millions)
Midwest Generation
 
Other EME Sub- sidiaries1
 
EME
 
Midwest Generation
 
Other EME Sub- sidiaries1
 
EME
Service cost
$
0.3

 
$
0.3

 
$
0.6

 
$
0.4

 
$
0.2

 
$
0.6

Interest cost
0.6

 
0.4

 
1.0

 
0.7

 
0.4

 
1.1

Net amortization
0.4

 
(0.1
)
 
0.3

 
0.4

 
(0.1
)
 
0.3

Total expense
$
1.3

 
$
0.6

 
$
1.9

 
$
1.5

 
$
0.5

 
$
2.0

1 
Excludes Homer City.
 
Six Months Ended June 30,
 
2013
 
2012
(in millions)
Midwest Generation
 
Other EME Sub- sidiaries1
 
EME
 
Midwest Generation
 
Other EME Sub- sidiaries1
 
EME
Service cost
$
0.6

 
$
0.6

 
$
1.2

 
$
0.8

 
$
0.4

 
$
1.2

Interest cost
1.2

 
0.8

 
2.0

 
1.4

 
0.8

 
2.2

Net amortization
0.8

 
(0.2
)
 
0.6

 
0.8

 
(0.1
)
 
0.7

Total expense
$
2.6

 
$
1.2

 
$
3.8

 
$
3.0

 
$
1.1

 
$
4.1

1 
Excludes Homer City.
Effective May 1, 2013, Homer City terminated further access and company subsidy of postretirement medical, dental, vision and life insurance coverage. For further discussion, see Note 13—Discontinued Operations.
Transfer of Certain Postretirement Benefits to EIX (EME only)
During 2012, EME transferred the executive deferred compensation and executive postretirement benefit liabilities related to active employees to EIX. EME agreed to fund changes to the projected benefit obligation of the executive postretirement benefits and the employer portion of the executive deferred compensation plan through EME's emergence from bankruptcy. During the six months ended June 30, 2013, EME funded $3 million in connection with this agreement.