Retirement Benefits and Trusteed Assets (OPEB - Reconciliation of Obligations, Assets and Funded Status of Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Change in accumulated postretirement benefit obligation
Plan amendments	$ 0	$ 4
Amounts recognized in Regulatory assets
Regulatory assets	4,336	3,677
Other postretirement benefit plan
Change in accumulated postretirement benefit obligation
Projected/Accumulated postretirement benefit obligation, beginning of year	1,702	1,807
Service cost	27	30	$ 26
Interest cost	48	46	56
Plan amendments	0	1
Actuarial gain	(395)	(100)
Benefits paid	(89)	(82)
Projected/Accumulated postretirement benefit obligation, end of year	1,293	1,702	1,807
Change in plan assets
Plan assets at fair value, beginning of year	2,021	1,960
Actual return on plan assets	(359)	142
Benefits paid	(85)	(81)
Plan assets at fair value, end of year	1,577	2,021	1,960
Funded status	284	319
Amount recorded as:
Noncurrent assets	571	678
Current liabilities	0	(1)
Noncurrent liabilities	(287)	(358)
Defined benefit plans assets (liabilities)	284	319
Amounts recognized in Accumulated other comprehensive income (loss), pre-tax
Net actuarial gain	(14)	(1)
Amounts recognized in Regulatory assets
Net actuarial loss	201	102
Prior service credit	(29)	(49)
Regulatory assets	172	53
DTE Electric
Amounts recognized in Regulatory assets
Regulatory assets	3,640	3,136
DTE Electric | Other postretirement benefit plan
Change in accumulated postretirement benefit obligation
Projected/Accumulated postretirement benefit obligation, beginning of year	1,293	1,369
Service cost	20	23	20
Interest cost	37	35	43
Plan amendments	0	0
Actuarial gain	(301)	(73)
Benefits paid	(67)	(61)
Projected/Accumulated postretirement benefit obligation, end of year	982	1,293	1,369
Change in plan assets
Plan assets at fair value, beginning of year	1,355	1,320
Actual return on plan assets	(239)	96
Benefits paid	(64)	(61)
Plan assets at fair value, end of year	1,052	1,355	$ 1,320
Funded status	70	62
Amount recorded as:
Noncurrent assets	345	402
Current liabilities	0	0
Noncurrent liabilities	(275)	(340)
Defined benefit plans assets (liabilities)	70	62
Amounts recognized in Accumulated other comprehensive income (loss), pre-tax
Net actuarial gain	0	0
Amounts recognized in Regulatory assets
Net actuarial loss	80	61
Prior service credit	(20)	(34)
Regulatory assets	$ 60	$ 27