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Retirement Benefits and Trusteed Assets
 9 Months Ended
Sep. 30, 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 September 30,
(In millions)
Service cost
$
27

 
$
19

 
$
8

 
$
8

Interest cost
52

 
54

 
20

 
22

Expected return on plan assets
(74
)
 
(69
)
 
(33
)
 
(31
)
Amortization of:
 
 
 
 
 
 
 
Net actuarial loss
51

 
42

 
10

 
4

Prior service credit
—

 
—

 
(31
)
 
(36
)
Net periodic benefit cost (credit)
$
56

 
$
46

 
$
(26
)
 
$
(33
)
 
Pension Benefits
 
Other Postretirement Benefits
 
2015
 
2014
 
2015
 
2014
Nine Months Ended September 30,
(In millions)
Service cost
$
76

 
$
62

 
$
25

 
$
26

Interest cost
158

 
159

 
61

 
67

Expected return on plan assets
(222
)
 
(205
)
 
(98
)
 
(92
)
Amortization of:
 
 
 
 
 
 
 
Net actuarial loss
154

 
118

 
32

 
15

Prior service credit
—

 
—

 
(94
)
 
(108
)
Net periodic benefit cost (credit)
$
166

 
$
134

 
$
(74
)
 
$
(92
)
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 September 30,
(In millions)
Service cost
$
21

 
$
14

 
$
6

 
$
6

Interest cost
39

 
41

 
15

 
17

Expected return on plan assets
(53
)
 
(48
)
 
(23
)
 
(21
)
Amortization of:
 
 
 
 
 
 
 
Net actuarial loss
36

 
30

 
8

 
3

Prior service credit
—

 
—

 
(24
)
 
(27
)
Net periodic benefit cost (credit)
$
43

 
$
37

 
$
(18
)
 
$
(22
)
 
Pension Benefits
 
Other Postretirement Benefits
 
2015
 
2014
 
2015
 
2014
Nine Months Ended September 30,
(In millions)
Service cost
$
59

 
$
48

 
$
19

 
$
19

Interest cost
120

 
121

 
46

 
51

Expected return on plan assets
(158
)
 
(145
)
 
(68
)
 
(63
)
Amortization of:
 
 
 
 
 
 
 
Net actuarial loss
110

 
83

 
24

 
11

Prior service cost (credit)
1

 
1

 
(71
)
 
(82
)
Net periodic benefit cost (credit)
$
132

 
$
108

 
$
(50
)
 
$
(64
)
Pension and Other Postretirement Contributions
During the first nine months of 2015, DTE Energy made cash contributions of $175 million, including contributions from DTE Electric of $145 million, to its pension plans.
During 2015, DTE Energy contributed the following amounts of DTE Energy common stock to the DTE Energy Company Master VEBA Trust for funding its other postretirement benefit plans:
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.
During 2015, DTE Energy also made cash contributions of $24 million, through contributions from DTE Gas, to the Master VEBA Trust for its other postretirement benefit plans. At the discretion of management, DTE Energy may make up to $60 million of additional contributions from DTE Electric 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.