Average Maturity of Debt Securities

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Equivalents
-URI http://asc.fasb.org/extlink&oid=6507016

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+ References

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- Definition

Amount after tax of reclassification adjustments of other comprehensive income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=66004921&loc=d3e1436-108581

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- Definition

Amount of gain (loss) realized from securities classified as trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7(c))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Trading Securities
-URI http://asc.fasb.org/extlink&oid=6526789

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Fair Value (Details Textuals) - USD ($)	3 Months Ended		12 Months Ended
Fair Value (Details Textuals) - USD ($)	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Fair Value, Option, Quantitative Disclosures [Line Items]
Trading securities realized gain (loss)	$ 5,000,000	$ 1,000,000
Recurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Cash equivalents	14,000,000		$ 16,000,000
Recurring \| Restricted assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Cash equivalents	7,000,000		8,000,000
Recurring \| Other investments
Fair Value, Option, Quantitative Disclosures [Line Items]
Cash equivalents	7,000,000		8,000,000
DTE Electric
Fair Value, Option, Quantitative Disclosures [Line Items]
Trading securities realized gain (loss)	5,000,000	1,000,000
DTE Electric \| Recurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Cash equivalents	7,000,000		8,000,000
DTE Electric \| Recurring \| Other investments
Fair Value, Option, Quantitative Disclosures [Line Items]
Cash equivalents	7,000,000		8,000,000
Nuclear decommissioning trust fund \| DTE Electric
Fair Value, Option, Quantitative Disclosures [Line Items]
Cash equivalents	$ 6,000,000		$ 6,000,000
Average maturity of debt securities (in years)	6 years		6 years
Accumulated Net Unrealized Investment Gain (Loss)
Fair Value, Option, Quantitative Disclosures [Line Items]
Unrealized losses on available for sale securities	$ 0	0
Accumulated Net Unrealized Investment Gain (Loss) \| DTE Electric
Fair Value, Option, Quantitative Disclosures [Line Items]
Unrealized losses on available for sale securities	$ 0	$ 0