Long-Term Debt (Debt Redemptions) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
Debt Instrument, Redemption [Line Items]
Amount	$ 286
Securitization Bonds | DTE Electric | March 6.62% 2015
Debt Instrument, Redemption [Line Items]
Interest Rate	6.62%
Amount	$ 105
Mortgage Bonds | DTE Electric | March 7.904% 2016
Debt Instrument, Redemption [Line Items]
Interest Rate	7.904%
Amount	$ 10
Senior Notes | DTE Gas | September 5.94% 2015
Debt Instrument, Redemption [Line Items]
Interest Rate	5.94%
Amount	$ 140
Tax-Exempt Revenue Bonds | DTE Electric | December 5.00% 2015
Debt Instrument, Redemption [Line Items]
Interest Rate	5.00%
Amount	$ 20
Other Long-Term Debt | DTE Energy
Debt Instrument, Redemption [Line Items]
Amount	$ 11