Long-Term Debt (Details Textuals) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
DTE Energy Junior Subordinated Debentures	$ 480	$ 480
6.5% Junior Subordinated Debentures Due 2061 \| Junior Subordinated Debentures
Debt Instrument [Line Items]
DTE Energy Junior Subordinated Debentures	$ 280	280
Interest rate	6.50%
5.25% Junior Subordinated Debentures Due 2062 \| Junior Subordinated Debentures
Debt Instrument [Line Items]
DTE Energy Junior Subordinated Debentures	$ 200	$ 200
Interest rate	5.30%

Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments, excluding current portion.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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