Long-Term Debt (Schedule of Issued Debt) (Details) $ in Millions	Mar. 31, 2023 USD ($)
Debt Instrument [Line Items]
Amount	$ 1,400
Unsecured term loan \| June 2022 Unsecured Term Loan Maturing in December 2023
Debt Instrument [Line Items]
Amount	$ 200
DTE Electric \| Mortgage Bonds \| March 2023 5.20% Mortgage Bonds Maturing in 2033
Debt Instrument [Line Items]
Interest rate	5.20%
Amount	$ 600
DTE Electric \| Mortgage Bonds \| March 2023 5.40% Mortgage Bonds Maturing in 2053
Debt Instrument [Line Items]
Interest rate	5.40%
Amount	$ 600

Face (par) amount of debt instrument at time of issuance.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant