Retirement Benefits and Trusteed Assets (Tables)

9 Months Ended

Sep. 30, 2020

Retirement Benefits [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 September 30,
	2020		2019		2020		2019
	(In millions)
Service cost	$	25	$	21	$	7	$	5
Interest cost	46		55		14		18
Expected return on plan assets	(84)		(82)		(32)		(30)
Amortization of:
Net actuarial loss	43		33		4		3
Prior service credit	—		—		(5)		(3)
Settlements	2		—		—		—
Net periodic benefit cost (credit)	$	32	$	27	$	(12)	$	(7)

	Pension Benefits				Other Postretirement Benefits
	Nine Months Ended September 30,
	2020		2019		2020		2019
	(In millions)
Service cost	$	74	$	63	$	20	$	16
Interest cost	139		164		42		53
Expected return on plan assets	(250)		(244)		(96)		(92)
Amortization of:
Net actuarial loss	129		99		12		9
Prior service credit	—		—		(15)		(7)
Settlements	2		—		—		—
Net periodic benefit cost (credit)	$	94	$	82	$	(37)	$	(21)

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
	(In millions)				(In millions)
Service cost	$	5	$	4	$	15	$	12
Interest cost	11		13		32		40
Expected return on plan assets	(21)		(21)		(65)		(63)
Amortization of:
Net actuarial loss	2		1		8		3
Prior service credit	(3)		(1)		(10)		(5)
Net periodic benefit credit	$	(6)	$	(4)	$	(20)	$	(13)

Schedule of the Contribution of Common Stock to the DTE Energy Company Affiliates Employee Benefit Plans Master Trust

Details of the contribution of common stock to the DTE Energy Company Affiliates Employee Benefit Plans Master Trust are as follows:

Date	Number of Shares	Price per Share		Amount
				(In millions)
September 8, 2020	694,444	$	118.08	$	82