Income Taxes (Details Textuals) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Entity Information [Line Items]
Deferred tax benefit for deferred tax remeasurement	$ 85,000,000	$ 85,000,000
Deferred tax expense for deferred intercompany gain recognized		9,000,000
Deferred tax asset, general business tax credit carryforwards		1,300,000,000
State and local net operating loss carry-forwards		73,000,000	$ 36,000,000
Valuation allowance		51,000,000	41,000,000
Interest on income taxes accrued		5,000,000	5,000,000
Interest on income taxes expense		0	1,000,000	$ 1,000,000
Penalties on income taxes accrued		0	0
State and local net operating loss carry-forwards
Entity Information [Line Items]
Valuation allowance		29,000,000	30,000,000
Charitable contribution carryforwards
Entity Information [Line Items]
Increase in valuation allowance		18,000,000
Federal
Entity Information [Line Items]
Net operating loss carry-forwards		950,000,000
DTE Electric
Entity Information [Line Items]
Income tax receivable from related party		31,000,000	8,000,000
State and local net operating loss carry-forwards		15,000,000	0
Valuation allowance		0	0
Interest on income taxes accrued		7,000,000	6,000,000
Interest on income taxes expense		1,000,000	1,000,000	$ 1,000,000
Penalties on income taxes accrued		0	$ 0
DTE Electric | General Business Credits
Entity Information [Line Items]
Tax credit carry-forward		379,000,000
DTE Electric | Federal
Entity Information [Line Items]
Net operating loss carry-forwards		$ 24,000,000