Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Entity Information [Line Items]
Deferred tax asset, general business tax credit carryforwards	$ 640
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	$ 70	$ 59
Valuation allowance	$ 40	$ 36
Statutory rate	35.00%	35.00%	35.00%
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	3	3
Interest on income taxes expense	0	2	$ 0
Federal
Entity Information [Line Items]
Operating loss carryforward	397
DTE Electric
Entity Information [Line Items]
Income tax receivable from related party	12	9
State and local net operating loss carry-forwards	5	1
Valuation allowance	$ 0	$ 0
Statutory rate	35.00%	35.00%	35.00%
Unrecognized tax benefits that would impact effective tax rate	$ 10	$ 10
Interest on income taxes accrued	4	4
Interest on income taxes expense	0	$ 3	$ 0
DTE Electric | General Business Credits
Entity Information [Line Items]
Tax credit carry-forward	193
DTE Electric | Federal
Entity Information [Line Items]
Operating loss carryforward	226
Refundable federal income taxes
Entity Information [Line Items]
Adjustment to deferred tax liabilities related to Tax Cuts and Jobs Act of 2017	2,450
Unregulated Operation
Entity Information [Line Items]
Adjustment to deferred tax liabilities related to Tax Cuts and Jobs Act of 2017	$ 105