Retirement Benefits and Trusteed Assets

3 Months Ended

Mar. 31, 2016

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
	2016			2015			2016			2015
Three Months Ended March 31,	(In millions)
Service cost	$	23		$	25		$	6		$	9
Interest cost	54			53			20			20
Expected return on plan assets	(77		)	(74		)	(32		)	(33		)
Amortization of:
Net actuarial loss	40			51			8			11
Prior service credit	—			—			(30		)	(31		)
Net periodic benefit cost (credit)	$	40		$	55		$	(28	)	$	(24	)

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
	2016			2015			2016			2015
Three Months Ended March 31,	(In millions)
Service cost	$	18		$	20		$	5		$	7
Interest cost	41			40			15			16
Expected return on plan assets	(55		)	(53		)	(23		)	(23		)
Amortization of:
Net actuarial loss	29			38			6			8
Prior service credit	—			—			(22		)	(24		)
Net periodic benefit cost (credit)	$	33		$	45		$	(19	)	$	(16	)

Pension and Other Postretirement Contributions

At the discretion of management, DTE Energy may make contributions up to $175 million, including contributions from DTE Electric of $145 million, to its pension plans in 2016.

At the discretion of management, DTE Energy may make up to $20 million, through contributions from DTE Gas, to its other postretirement benefit plans in 2016.