Retirement Benefits and Trusteed Assets (Tables)

6 Months Ended

Jun. 30, 2015

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

Schedule of Net Benefit Costs

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
	2015			2014			2015			2014
Three Months Ended June 30,	(In millions)
Service cost	$	24		$	22		$	8		$	9
Interest cost	53			52			21			22
Expected return on plan assets	(74		)	(68		)	(32		)	(30		)
Amortization of:
Net actuarial loss	52			38			11			6
Prior service cost (credit)	—			—			(32		)	(36		)
Net periodic benefit cost (credit)	$	55		$	44		$	(24	)	$	(29	)

	Pension Benefits						Other Postretirement Benefits
	2015			2014			2015			2014
Six Months Ended June 30,	(In millions)
Service cost	$	49		$	43		$	17		$	18
Interest cost	106			105			41			45
Expected return on plan assets	(148		)	(136		)	(65		)	(61		)
Amortization of:
Net actuarial loss	103			76			22			11
Prior service cost (credit)	—			—			(63		)	(72		)
Net periodic benefit cost (credit)	$	110		$	88		$	(48	)	$	(59	)

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
	2015			2014			2015			2014
Three Months Ended June 30,	(In millions)
Service cost	$	18		$	17		$	6		$	6
Interest cost	41			40			15			17
Expected return on plan assets	(52		)	(49		)	(22		)	(21		)
Amortization of:
Net actuarial loss	36			26			8			5
Prior service cost (credit)	1			1			(23		)	(28		)
Net periodic benefit cost (credit)	$	44		$	35		$	(16	)	$	(21	)

	Pension Benefits						Other Postretirement Benefits
	2015			2014			2015			2014
Six Months Ended June 30,	(In millions)
Service cost	$	38		$	34		$	13		$	13
Interest cost	81			80			31			34
Expected return on plan assets	(105		)	(97		)	(45		)	(42		)
Amortization of:
Net actuarial loss	74			53			16			8
Prior service cost (credit)	1			1			(47		)	(55		)
Net periodic benefit cost (credit)	$	89		$	71		$	(32	)	$	(42	)

Schedule of Contributions

During 2015, DTE Energy contributed the following amounts of DTE Energy common stock to the DTE Energy Company Master VEBA Trust for funding its other postretirement benefit plans:

Date	Number of Shares	Price per Share	Amount
			(In millions)
February 17, 2015	1,427,835	$81.91	$	117
			$	117