Long-Term Debt (Schedule of Debt Redeemed) (Details) - DTE Electric - Senior Notes - 4.89% Senior Notes Maturing 2020 $ in Millions	6 Months Ended
Jun. 30, 2020 USD ($)
Debt Instrument, Redemption [Line Items]
Interest rate	4.89%
Debt redeemed	$ 300

Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant