Long-Term Debt (Debt Redemptions) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
Debt Instrument, Redemption [Line Items]
Amount	$ 807
Mortgages | DTE Electric | March 7.904% mortgage bonds maturing 2016
Debt Instrument, Redemption [Line Items]
Interest Rate	7.904%
Amount	$ 10
Senior notes | DTE Energy | June 6.35% senior notes due 2016
Debt Instrument, Redemption [Line Items]
Interest Rate	6.35%
Amount	$ 300
Junior subordinated debentures | DTE Energy | December 6.5% junior subordinated debentures maturing in 2061
Debt Instrument, Redemption [Line Items]
Interest Rate	6.50%
Amount	$ 280
Secured debt | DTE Energy | December 8.75% senior secured term loan maturing 2022
Debt Instrument, Redemption [Line Items]
Interest Rate	8.75%
Amount	$ 204
Other long-term debt | DTE Energy
Debt Instrument, Redemption [Line Items]
Amount	$ 13