Long-Term Debt (Debt Issuances) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Nov. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Oct. 31, 2023	Jun. 30, 2023	May 31, 2023	Mar. 31, 2023
Debt Instrument [Line Items]
Amount		$ 3,197
Proceeds from issuance of long-term debt, net of issuance costs		3,167	$ 2,171	$ 4,457
Unsecured | Term Loan Facility
Debt Instrument [Line Items]
Amount								$ 200
Senior Notes | May 2023 4.875% Senior Notes
Debt Instrument [Line Items]
Interest Rate							4.875%
Amount							$ 800
DTE Electric
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt, net of issuance costs		$ 1,881	$ 1,118	$ 985
DTE Electric | DTE Energy
Debt Instrument [Line Items]
Payments of special dividend	$ 297
DTE Electric | Mortgage Bonds | March 2023 5.20% Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate								5.20%
Amount								$ 600
DTE Electric | Mortgage Bonds | March 2023 5.40% Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate								5.40%
Amount								$ 600
DTE Electric | Tax-Exempt Revenue Bonds | June 2023 3.875% Tax-Exempt Revenue Bonds
Debt Instrument [Line Items]
Interest Rate						3.875%
Amount						$ 100
DTE Electric | Securitization Bonds | November 2023 5.97% Securitization Bonds
Debt Instrument [Line Items]
Interest Rate	5.97%
Amount	$ 301
DTE Electric | Securitization Bonds | November 2023 6.09% Securitization Bonds
Debt Instrument [Line Items]
Interest Rate	6.09%
Amount	$ 301
DTE Electric | Securitization Bonds | November 2023 Securitization Bonds, used for partial repayment of mortgage bonds
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt, net of issuance costs	$ 297
DTE Gas | Mortgage Bonds | October 2023 5.57% First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate					5.57%
Amount					$ 150
DTE Gas | Mortgage Bonds | October 2023 5.73% First Mortgage Bonds
Debt Instrument [Line Items]
Interest Rate					5.73%
Amount					$ 145