Retirement Benefits and Trusteed Assets (Tables)

6 Months Ended

Jun. 30, 2019

Defined Benefit Plan [Abstract]

Schedule of Net Periodic Benefit Costs (Credits)

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
	Three Months Ended June 30,
	2019			2018			2019			2018
	(In millions)
Service cost	$	21		$	25		$	6		$	7
Interest cost	54			50			17			17
Expected return on plan assets	(81		)	(83		)	(31		)	(35		)
Amortization of:
Net actuarial loss	34			45			3			2
Prior service credit	—			—			(2		)	—
Net periodic benefit cost (credit)	$	28		$	37		$	(7	)	$	(9	)

	Pension Benefits						Other Postretirement Benefits
	Six Months Ended June 30,
	2019			2018			2019			2018
	(In millions)
Service cost	$	42		$	50		$	11		$	14
Interest cost	109			100			35			34
Expected return on plan assets	(162		)	(165		)	(62		)	(71		)
Amortization of:
Net actuarial loss	66			89			6			5
Prior service credit	—			—			(4		)	—
Net periodic benefit cost (credit)	$	55		$	74		$	(14	)	$	(18	)

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

	Other Postretirement Benefits
	Three Months Ended June 30,
	2019			2018
	(In millions)
Service cost	$	4		$	5
Interest cost	14			14
Expected return on plan assets	(21		)	(25		)
Amortization of:
Net actuarial loss	1			2
Prior service credit	(3		)	—
Net periodic benefit credit	$	(5	)	$	(4	)

	Other Postretirement Benefits
	Six Months Ended June 30,
	2019			2018
	(In millions)
Service cost	$	8		$	10
Interest cost	27			27
Expected return on plan assets	(42		)	(49		)
Amortization of:
Net actuarial loss	2			4
Prior service credit	(4		)	—
Net periodic benefit credit	$	(9	)	$	(8	)

Schedule of Defined Benefit Plans Disclosures

During 2019, DTE Energy contributed the following amounts of DTE Energy common stock to the DTE Energy Company Affiliates Employee Benefit Plans Master Trust:

Date	Number of Shares	Price per Share	Amount
			(In millions)
March 5, 2019	814,597	$122.76	$	100