Retirement Benefits and Trusteed Assets

6 Months Ended

Jun. 30, 2016

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

Retirement Benefits and Trusteed Assets

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
	2016			2015			2016			2015
Three Months Ended June 30,	(In millions)
Service cost	$	23		$	24		$	7		$	8
Interest cost	55			53			20			21
Expected return on plan assets	(78		)	(74		)	(32		)	(32		)
Amortization of:
Net actuarial loss	41			52			8			11
Prior service credit	—			—			(29		)	(32		)
Net periodic benefit cost (credit)	$	41		$	55		$	(26	)	$	(24	)

	Pension Benefits						Other Postretirement Benefits
	2016			2015			2016			2015
Six Months Ended June 30,	(In millions)
Service cost	$	46		$	49		$	13		$	17
Interest cost	109			106			40			41
Expected return on plan assets	(155		)	(148		)	(64		)	(65		)
Amortization of:
Net actuarial loss	81			103			16			22
Prior service credit	—			—			(59		)	(63		)
Net periodic benefit cost (credit)	$	81		$	110		$	(54	)	$	(48	)

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
	2016			2015			2016			2015
Three Months Ended June 30,	(In millions)
Service cost	$	17		$	18		$	5		$	6
Interest cost	42			41			16			15
Expected return on plan assets	(55		)	(52		)	(22		)	(22		)
Amortization of:
Net actuarial loss	28			36			5			8
Prior service cost (credit)	1			1			(22		)	(23		)
Net periodic benefit cost (credit)	$	33		$	44		$	(18	)	$	(16	)

	Pension Benefits						Other Postretirement Benefits
	2016			2015			2016			2015
Six Months Ended June 30,	(In millions)
Service cost	$	35		$	38		$	10		$	13
Interest cost	83			81			31			31
Expected return on plan assets	(110		)	(105		)	(45		)	(45		)
Amortization of:
Net actuarial loss	57			74			11			16
Prior service cost (credit)	1			1			(44		)	(47		)
Net periodic benefit cost (credit)	$	66		$	89		$	(37	)	$	(32	)

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 contributions up to $20 million, through contributions from DTE Gas, to its other postretirement benefit plans in 2016.