Retirement Benefits and Trusteed Assets (Tables)

3 Months Ended

Mar. 31, 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 other postretirement benefits for DTE Electric:

	Other Postretirement Benefits
	Three Months Ended March 31,
	2019			2018
	(In millions)
Service cost	$	4		$	5
Interest cost	13			13
Expected return on plan assets	(21		)	(24		)
Amortization of:
Net actuarial loss	1			2
Prior service credit	(1		)	—
Net periodic benefit credit	$	(4	)	$	(4	)

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 March 31,
	2019			2018			2019			2018
	(In millions)
Service cost	$	21		$	25		$	5		$	7
Interest cost	55			50			18			17
Expected return on plan assets	(81		)	(82		)	(31		)	(36		)
Amortization of:
Net actuarial loss	32			44			3			3
Prior service credit	—			—			(2		)	—
Net periodic benefit cost (credit)	$	27		$	37		$	(7	)	$	(9	)

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