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Retirement Benefits and Trusteed Assets
 3 Months Ended
Mar. 31, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Retirement Benefits and Trusteed Assets
RETIREMENT BENEFITS AND TRUSTEED ASSETS
The following table details the components of net periodic benefit costs for pension benefits and other postretirement benefits for DTE Energy:
 
Pension Benefits
 
Other Postretirement Benefits
 
2015
 
2014
 
2015
 
2014
Three Months Ended March 31,
(In millions)
Service cost
$
25

 
$
21

 
$
9

 
$
9

Interest cost
53

 
53

 
20

 
23

Expected return on plan assets
(74
)
 
(68
)
 
(33
)
 
(31
)
Amortization of:
 
 
 
 
 
 
 
Net actuarial loss
51

 
38

 
11

 
5

Prior service credit
—

 
—

 
(31
)
 
(36
)
Net periodic benefit cost (credit)
$
55

 
$
44

 
$
(24
)
 
$
(30
)
The following table details the components of net periodic benefit costs for pension benefits and other postretirement benefits for DTE Electric:
 
Pension Benefits
 
Other Postretirement Benefits
 
2015
 
2014
 
2015
 
2014
Three Months Ended March 31,
(In millions)
Service cost
$
20

 
$
17

 
$
7

 
$
7

Interest cost
40

 
40

 
16

 
17

Expected return on plan assets
(53
)
 
(48
)
 
(23
)
 
(21
)
Amortization of:
 
 
 
 
 
 
 
Net actuarial loss
38

 
27

 
8

 
3

Prior service cost (credit)
—

 
—

 
(24
)
 
(27
)
Net periodic benefit cost (credit)
$
45

 
$
36

 
$
(16
)
 
$
(21
)
Pension and Other Postretirement Contributions
In April 2015, DTE Energy made contributions of $25 million, through contributions from DTE Electric, to its pension plans. At the discretion of management, and depending upon financial market conditions, DTE Energy may make up to $150 million of additional contributions, including up to $120 million of additional DTE Electric contributions, to its pension plans in 2015.
During 2015, DTE Energy contributed the following amounts of DTE Energy common stock to the DTE Energy Company Master VEBA Trust:
Date
 
Number of Shares
 
Price per Share
 
Amount
 
 
 
 
 
 
(In millions)
February 17, 2015
 
1,427,835
 
$81.91
 
$
117

 
 
 
 
 
 
$
117


The above contribution was made on behalf of DTE Electric, who paid DTE Energy cash consideration of $117 million in February 2015.
At the discretion of management, DTE Energy may make up to $80 million of additional contributions, including up to $60 million of additional DTE Electric contributions, to its other postretirement benefit plans in 2015.
Plan Changes
In 2015, certain executive retirement benefit plans were amended to transfer the obligation for benefits as attributed to DTE Energy Corporate Services, LLC (LLC), a subsidiary of DTE Energy. The related plan liabilities were transferred from DTE Electric and DTE Gas to LLC. The related Rabbi Trust assets were also transferred to DTE Energy from DTE Electric.