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Compensation and Benefit Plans
 3 Months Ended
Mar. 31, 2012
Compensation and Retirement Disclosure [Abstract]  
Compensation and Benefit Plans
Compensation and Benefit Plans
Pension Plans and Postretirement Benefits Other than Pensions
Pension Plans
During the three months ended March 31, 2012, EME made contributions of $4 million, and during the remainder of 2012, expects to make $14 million of additional contributions. The following were components of pension expense:
 
Three Months Ended March 31,
(in millions)
2012
 
2011
Service cost
$
5

 
$
4

Interest cost
3

 
4

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

 
1

Total expense
$
6

 
$
6

Postretirement Benefits Other Than Pensions
During the three months ended March 31, 2012, EME made contributions of $1 million, and during the remainder of 2012, expects to make $2 million of additional contributions.
The following were components of postretirement benefits expense:
 
Three Months Ended March 31,
(in millions)
2012
 
2011
Service cost
$
1

 
$
1

Interest cost
2

 
2

Total expense
$
3

 
$
3

Transfer of Certain Post Retirement Benefits to Edison International
In March 2012, Edison International agreed to assume the liabilities for active employees of EME and its subsidiaries under the specified plans related to deferred compensation and executive post retirement benefits. In consideration for such assumption, EME and its subsidiaries paid Edison International the after tax amount of such liabilities as of March 1, 2012 ($25 million) and will fund additional liabilities in future periods.