Fair Value (Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Carrying amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable, excluding capital leases	$ 37	$ 38
Dividends payable	161	158
Short-term borrowings	77	621
Notes payable — Other, excluding capital leases	11	12
Long-term debt	13,621	12,288
Carrying amount \| DTE Electric
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term borrowings	51	238
Notes payable — Other, excluding capital leases	2	2
Long-term debt	6,537	6,017
Carrying amount \| DTE Electric \| Affiliates
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term borrowings	143	116
Fair value \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable, excluding capital leases	0	0
Dividends payable	161	158
Short-term borrowings	0	0
Notes payable — Other, excluding capital leases	0	0
Long-term debt	1,840	1,939
Fair value \| Level 1 \| DTE Electric
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term borrowings	0	0
Notes payable — Other, excluding capital leases	0	0
Long-term debt	0	0
Fair value \| Level 1 \| DTE Electric \| Affiliates
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term borrowings	0	0
Fair value \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable, excluding capital leases	0	0
Dividends payable	0	0
Short-term borrowings	77	621
Notes payable — Other, excluding capital leases	0	0
Long-term debt	11,094	10,571
Fair value \| Level 2 \| DTE Electric
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term borrowings	51	238
Notes payable — Other, excluding capital leases	0	0
Long-term debt	6,715	6,441
Fair value \| Level 2 \| DTE Electric \| Affiliates
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term borrowings	0	0
Fair value \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable, excluding capital leases	37	38
Dividends payable	0	0
Short-term borrowings	0	0
Notes payable — Other, excluding capital leases	11	12
Long-term debt	930	764
Fair value \| Level 3 \| DTE Electric
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term borrowings	0	0
Notes payable — Other, excluding capital leases	2	2
Long-term debt	0	171
Fair value \| Level 3 \| DTE Electric \| Affiliates
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term borrowings	$ 143	$ 116

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

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- Definition

Fair value portion of notes payable.

+ References

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 210.5-02.19,20,22)
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- Definition

Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date.

+ References

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 210.5-02.3(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date.

+ References

No definition available.

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