Long-Term Debt (Schedule of Issued Debt) (Details)	Mar. 31, 2021 USD ($)
Debt Instrument [Line Items]
Debt issued	$ 1,000,000,000
DTE Electric \| Mortgage Bonds \| March 2021 1.9% Mortgage Bonds Maturing in 2028
Debt Instrument [Line Items]
Interest rate	1.90%
Debt issued	$ 575,000,000
DTE Electric \| Mortgage Bonds \| March 2021 3.25% Mortgage Bonds Maturing In 2051
Debt Instrument [Line Items]
Interest rate	3.25%
Debt issued	$ 425,000,000

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

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