Retirement Benefits and Trusteed Assets (Details Textuals) - USD ($)		1 Months Ended	3 Months Ended			9 Months Ended
	Sep. 08, 2020	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Contribution of common stock to pension plan			$ 82,000,000		$ 100,000,000
Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Cash contribution						$ 2,000,000
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Contribution of common stock to pension plan	$ 82,000,000
Pension Benefits | Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer						84,000,000
Contribution of common stock to pension plan						82,000,000
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Anticipated contributions, remainder of fiscal year		$ 0	0			0
DTE Electric | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Pension cost			$ 28,000,000	$ 23,000,000		$ 79,000,000	$ 68,000,000
Cash contribution		60,000,000
DTE Gas | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Cash contribution		$ 22,000,000