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Retirement Benefits and Trusteed Assets (Tables)
 3 Months Ended
Mar. 31, 2020
Defined Benefit Plan [Abstract]  
Schedule of Net Periodic Benefit Costs (Credits)
The following tables detail the components of net periodic benefit costs (credits) for other postretirement benefits for DTE Electric:
 
Other Postretirement Benefits
 
Three Months Ended March 31,
 
2020
 
2019
 
(In millions)
Service cost
$
5

 
$
4

Interest cost
11

 
13

Expected return on plan assets
(22
)
 
(21
)
Amortization of:
 
 
 
Net actuarial loss
3

 
1

Prior service credit
(4
)
 
(1
)
Net periodic benefit credit
$
(7
)
 
$
(4
)

The following tables detail the components of net periodic benefit costs (credits) for pension benefits and other postretirement benefits for DTE Energy:
 
Pension Benefits
 
Other Postretirement Benefits
 
Three Months Ended March 31,
 
2020
 
2019
 
2020
 
2019
 
(In millions)
Service cost
$
25

 
$
21

 
$
6

 
$
5

Interest cost
46

 
55

 
14

 
18

Expected return on plan assets
(83
)
 
(81
)
 
(32
)
 
(31
)
Amortization of:
 
 
 
 
 
 
 
Net actuarial loss
43

 
32

 
5

 
3

Prior service credit
—

 
—

 
(5
)
 
(2
)
Net periodic benefit cost (credit)
$
31

 
$
27

 
$
(12
)
 
$
(7
)