Long-Term Debt (Schedule of Issued Debt) (Details)	9 Months Ended
	Sep. 30, 2020 USD ($)
Debt Instrument [Line Items]
Debt issued	$ 2,750,000,000
Repayment of debt	$ 682,000,000
Senior Notes | August 2020 1.05% Mortgage Bonds Maturing 2025
Debt Instrument [Line Items]
Interest rate	1.05%
Debt issued	$ 800,000,000
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 | Mortgage Bonds | April 2020 2.63% Mortgage Bonds Maturing 2031
Debt Instrument [Line Items]
Interest rate	2.63%
Debt issued	$ 600,000,000
DTE Electric | Senior Notes | 4.89% Senior Notes Maturing 2020
Debt Instrument [Line Items]
Interest rate	4.89%
Repayment of debt	$ 300,000,000
DTE Electric | Senior Notes | 2010 Series B 3.45% Senior Notes Due 2020
Debt Instrument [Line Items]
Interest rate	3.45%
Repayment of debt	$ 300,000,000
DTE Electric | Senior Notes | 2008 Series KT Variable Rate Senior Notes Due 2020
Debt Instrument [Line Items]
Repayment of debt	$ 32,000,000
DTE Electric | Senior Notes | 6.36% Senior Notes Maturing 2020
Debt Instrument [Line Items]
Interest rate	6.36%
Repayment of debt	$ 50,000,000
DTE Gas | Mortgage Bonds | August 2020 2.35% Mortgage Bonds Maturing 2030
Debt Instrument [Line Items]
Interest rate	2.35%
Debt issued	$ 125,000,000
DTE Gas | Mortgage Bonds | August 2020 3.20% Mortgage Bonds Maturing 2050
Debt Instrument [Line Items]
Interest rate	3.20%
Debt issued	$ 125,000,000
DTE Gas | Senior Notes | 6.36% Senior Notes Maturing 2020
Debt Instrument [Line Items]
Interest rate	6.36%
Repayment of debt	$ 50,000,000