Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Basic Earnings per Share
Net Income Attributable to DTE Energy Company	$ 191	$ 334	$ 234	$ 361	$ 287	$ 270	$ 177	$ 400	$ 1,120	$ 1,134	$ 868
Less: Allocation of earnings to net restricted stock awards									(2)	(2)	(2)
Net income available to common shareholders — basic									$ 1,118	$ 1,132	$ 866
Average number of common shares outstanding — basic (in shares)									181.0	179.0	179.0
Basic Earnings per Common Share (in dollars per share)	$ 1.05	$ 1.84	$ 1.29	$ 2.01	$ 1.60	$ 1.51	$ 0.99	$ 2.23	$ 6.18	$ 6.32	$ 4.84
Diluted Earnings per Share
Net Income Attributable to DTE Energy Company	$ 191	$ 334	$ 234	$ 361	$ 287	$ 270	$ 177	$ 400	$ 1,120	$ 1,134	$ 868
Less: Allocation of earnings to net restricted stock awards									(2)	(2)	(2)
Net income available to common shareholders — diluted									$ 1,118	$ 1,132	$ 866
Average number of common shares outstanding — diluted (in shares)									181.0	179.0	179.0
Diluted Earnings per Common Share (in dollars per share)	$ 1.05	$ 1.84	$ 1.29	$ 2.00	$ 1.60	$ 1.51	$ 0.99	$ 2.23	$ 6.17	$ 6.32	$ 4.83
Incremental common shares attributable to dilutive effect of equity units (in shares)									6.3	6.3