Revenue - Narrative (Details) $ in Millions	12 Months Ended
Dec. 31, 2018 USD ($)
Revenue from External Customer [Line Items]
Charges related to expense recognized for estimated uncollectible accounts receivable	$ 140
DTE Electric
Revenue from External Customer [Line Items]
Charges related to expense recognized for estimated uncollectible accounts receivable	$ 85
Other \| Power and Industrial Projects
Revenue from External Customer [Line Items]
Payment terms	30 days

Amount of direct write-downs of accounts receivable charged against the allowance.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.4)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration