Income Taxes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Entity Information [Line Items]
Deferred tax asset, general business tax credit carryforwards	$ 1,010,000,000.00
Deferred tax asset, alternative minimum tax credit carryforwards	$ 153,000,000
Tax credit carry forwards refundable period	3 years
State and local net operating loss carry-forwards	$ 117,000,000	$ 59,000,000
Valuation allowance	40,000,000	33,000,000
Adjustment to deferred tax liabilities related to Tax Cuts and Jobs Act of 2017	2,560,000,000
True-up adjustments to remeasurement of deferred taxes		21,000,000
Unrecognized tax benefits that would impact effective tax rate	8,000,000	8,000,000
Interest on income taxes accrued	4,000,000	4,000,000
Interest on income taxes expense	1,000,000	1,000,000	$ 0
Unregulated Operation
Entity Information [Line Items]
Adjustment to deferred tax liabilities related to Tax Cuts and Jobs Act of 2017	105,000,000
Regulated Operation
Entity Information [Line Items]
True-up adjustments to remeasurement of deferred taxes		17,000,000
Refundable federal income taxes
Entity Information [Line Items]
Adjustment to deferred tax liabilities related to Tax Cuts and Jobs Act of 2017	2,450,000,000
Federal
Entity Information [Line Items]
Net operating loss carry-forwards	1,300,000,000
DTE Electric
Entity Information [Line Items]
Income tax receivable from related party	14,000,000	8,000,000
State and local net operating loss carry-forwards	0	1,000,000
Valuation allowance	0	0
True-up adjustments to remeasurement of deferred taxes		7,000,000
Unrecognized tax benefits that would impact effective tax rate	10,000,000	10,000,000
Interest on income taxes accrued	6,000,000	$ 5,000,000
Interest on income taxes expense	1,000,000		$ 0
DTE Electric | General Business Credits
Entity Information [Line Items]
Tax credit carry-forward	$ 252,000,000