Retirement Benefits and Trusteed Assets

3 Months Ended

Mar. 31, 2017

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

RETIREMENT BENEFITS AND TRUSTEED ASSETS

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
	2017			2016			2017			2016
Three Months Ended March 31,	(In millions)
Service cost	$	24		$	23		$	7		$	6
Interest cost	54			54			18			20
Expected return on plan assets	(78		)	(77		)	(33		)	(32		)
Amortization of:
Net actuarial loss	43			40			3			8
Prior service credit	—			—			(3		)	(30		)
Net periodic benefit cost (credit)	$	43		$	40		$	(8	)	$	(28	)

The following tables detail the components of net periodic benefit costs (credits) for pension benefits and other postretirement benefits for DTE Electric:



	Pension Benefits						Other Postretirement Benefits
	2017			2016			2017			2016
Three Months Ended March 31,	(In millions)
Service cost	$	18		$	18		$	5		$	5
Interest cost	41			41			14			15
Expected return on plan assets	(55		)	(55		)	(23		)	(23		)
Amortization of:
Net actuarial loss	31			29			2			6
Prior service credit	—			—			(2		)	(22		)
Net periodic benefit cost (credit)	$	35		$	33		$	(4	)	$	(19	)

Pension and Other Postretirement Contributions

During the first three months of 2017, DTE Energy made cash contributions of $126 million, including contributions from DTE Electric of $125 million, to its pension plans. At the discretion of management and depending upon financial market conditions, DTE Energy may make additional contributions up to $180 million, including additional contributions from DTE Electric of $145 million, to its pension plans in 2017.

DTE Energy does not anticipate making any contributions to the other postretirement benefit plans in 2017.