Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Basic Earnings per Share
Net Income Attributable to DTE Energy Company	$ 234	$ 177	$ 595	$ 577
Less: Allocation of earnings to net restricted stock awards	0	0	1	1
Net income available to common shareholders — basic	$ 234	$ 177	$ 594	$ 576
Average number of common shares outstanding — basic (in shares)	181.0	179.0	180.0	179.0
Basic Earnings per Common Share (in dollars per share)	$ 1.29	$ 0.99	$ 3.29	$ 3.21
Diluted Earnings per Share
Net Income Attributable to DTE Energy Company	$ 234	$ 177	$ 595	$ 577
Less: Allocation of earnings to net restricted stock awards	0	0	1	1
Net income available to common shareholders — diluted	$ 234	$ 177	$ 594	$ 576
Average number of common shares outstanding — diluted (in shares)	181.0	179.0	180.0	179.0
Diluted Earnings per Common Share (in dollars per share)	$ 1.29	$ 0.99	$ 3.29	$ 3.21
Antidilutive securities excluded from computation of earnings per share (in shares)	6.6	6.3	6.6	6.6