Long-Term Debt (Debt Issuances) (Details) - USD ($)	Dec. 31, 2016	Oct. 31, 2016	Oct. 05, 2016
Debt Instrument [Line Items]
Amount	$ 2,680,000,000
Senior notes | October series C 1.5% RSNs maturing 2024
Debt Instrument [Line Items]
Interest Rate		1.50%	1.50%
Amount	$ 675,000,000	$ 675,000,000	$ 675,000,000
Senior notes | October series E 2.85% senior notes maturing 2026
Debt Instrument [Line Items]
Interest Rate		2.85%
Amount		$ 600,000,000
Senior notes | October series D 1.50% senior notes maturing 2019
Debt Instrument [Line Items]
Interest Rate		1.50%
Amount		$ 400,000,000
DTE Electric | Mortgages | May 3.70% mortgage bonds maturing in 2046
Debt Instrument [Line Items]
Interest Rate	3.70%
Amount	$ 300,000,000
DTE Energy | Junior subordinated debentures | May 5.375% junior subordinated debentures maturing in 2076
Debt Instrument [Line Items]
Interest Rate	5.375%
Amount	$ 300,000,000
DTE Energy | Junior subordinated debentures | December 6% junior subordinated debentures maturing in 2076
Debt Instrument [Line Items]
Interest Rate	6.00%
Amount	$ 280,000,000
DTE Energy | Senior notes | October series E 2.85% senior notes maturing 2026
Debt Instrument [Line Items]
Interest Rate	2.85%
Amount	$ 600,000,000
DTE Energy | Senior notes | October series D 1.50% senior notes maturing 2019
Debt Instrument [Line Items]
Interest Rate	1.50%
Amount	$ 400,000,000
DTE Gas | Mortgages | December 4.07% mortgage bonds maturing in 2046
Debt Instrument [Line Items]
Interest Rate	4.07%
Amount	$ 125,000,000