Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Basic Earnings per Share
Net Income Attributable to DTE Energy Company	$ 361	$ 400
Less: Allocation of earnings to net restricted stock awards	1	1
Net income available to common shareholders — basic	$ 360	$ 399
Average number of common shares outstanding (in shares)	180.0	179.0
Basic Earnings per Common Share (in dollars per share)	$ 2.01	$ 2.23
Diluted Earnings per Share
Net Income Attributable to DTE Energy Company	$ 361	$ 400
Less: Allocation of earnings to net restricted stock awards	1	1
Net income available to common shareholders — diluted	$ 360	$ 399
Average number of common shares outstanding (in shares)	180.0	179.0
Diluted Earnings per Common Share (in dollars per share)	$ 2.00	$ 2.23
Antidilutive securities excluded from computation of earnings per share (in shares)	6.6	6.8