Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Entity Information [Line Items]
Deferred tax asset, general business tax credit carryforwards	$ 871
Deferred tax asset, alternative minimum tax credit carryforwards	$ 307
Tax credit carry forwards refundable period	4 years
State and local net operating loss carry-forwards	$ 59	$ 70
Valuation allowance	33	40
Adjustment to deferred tax liabilities related to Tax Cuts and Jobs Act of 2017	2,560
Unrecognized tax benefits that would impact effective tax rate	8	8
Interest on income taxes accrued	4	3
Interest on income taxes expense	1	0	$ 2
Unregulated Operation
Entity Information [Line Items]
Adjustment to deferred tax liabilities related to Tax Cuts and Jobs Act of 2017	105
Refundable federal income taxes
Entity Information [Line Items]
Adjustment to deferred tax liabilities related to Tax Cuts and Jobs Act of 2017	2,450
Federal
Entity Information [Line Items]
Operating loss carryforward	555
DTE Electric
Entity Information [Line Items]
Income tax receivable from related party	8	12
State and local net operating loss carry-forwards	1	5
Valuation allowance	0	0
Unrecognized tax benefits that would impact effective tax rate	10	10
Interest on income taxes accrued	5	4
Interest on income taxes expense	1	$ 0	$ 3
DTE Electric | General Business Credits
Entity Information [Line Items]
Tax credit carry-forward	250
DTE Electric | Federal
Entity Information [Line Items]
Operating loss carryforward	$ 11