Long-Term Debt (Schedule of Issued Debt) (Details)	3 Months Ended
	Mar. 31, 2020 USD ($)
Debt Instrument [Line Items]
Debt issued	$ 1,100,000,000
Repayment of debt	$ 300,000,000
DTE Electric | Mortgage Bonds | February 2020 2.25% Mortgage Bonds Maturing 2030
Debt Instrument [Line Items]
Interest rate	2.25%
Debt issued	$ 600,000,000
DTE Electric | Mortgage Bonds | February 2020 2.95% Mortgage Bonds Maturing 2050
Debt Instrument [Line Items]
Interest rate	2.95%
Debt issued	$ 500,000,000
DTE Electric | Senior Notes | March 2020 4.89% Senior Notes Maturing 2020
Debt Instrument [Line Items]
Interest rate	4.89%
Repayment of debt	$ 300,000,000