Retirement Benefits and Trusteed Assets

9 Months Ended

Sep. 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 September 30,	(In millions)
Service cost	$	23		$	27		$	7		$	8
Interest cost	55			52			20			20
Expected return on plan assets	(77		)	(74		)	(33		)	(33		)
Amortization of:
Net actuarial loss	43			51			6			10
Prior service credit	—			—			(29		)	(31		)
Net periodic benefit cost (credit)	$	44		$	56		$	(29	)	$	(26	)

	Pension Benefits						Other Postretirement Benefits
	2016			2015			2016			2015
Nine Months Ended September 30,	(In millions)
Service cost	$	69		$	76		$	20		$	25
Interest cost	164			158			60			61
Expected return on plan assets	(232		)	(222		)	(97		)	(98		)
Amortization of:
Net actuarial loss	124			154			22			32
Prior service credit	—			—			(88		)	(94		)
Net periodic benefit cost (credit)	$	125		$	166		$	(83	)	$	(74	)

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 September 30,	(In millions)
Service cost	$	18		$	21		$	5		$	6
Interest cost	42			39			15			15
Expected return on plan assets	(55		)	(53		)	(23		)	(23		)
Amortization of:
Net actuarial loss	31			36			4			8
Prior service credit	—			—			(22		)	(24		)
Net periodic benefit cost (credit)	$	36		$	43		$	(21	)	$	(18	)

	Pension Benefits						Other Postretirement Benefits
	2016			2015			2016			2015
Nine Months Ended September 30,	(In millions)
Service cost	$	53		$	59		$	15		$	19
Interest cost	125			120			46			46
Expected return on plan assets	(165		)	(158		)	(68		)	(68		)
Amortization of:
Net actuarial loss	88			110			15			24
Prior service cost (credit)	1			1			(66		)	(71		)
Net periodic benefit cost (credit)	$	102		$	132		$	(58	)	$	(50	)

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.