Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Basic Earnings per Share
Net Income Attributable to DTE Energy Company	$ 182	$ 234	$ 583	$ 595
Less: Allocation of earnings to net restricted stock awards	0	0	1	1
Net income available to common shareholders — basic	$ 182	$ 234	$ 582	$ 594
Average number of common shares outstanding — basic (in shares)	183.0	181.0	183.0	180.0
Basic Earnings per Common Share (in dollars per share)	$ 0.99	$ 1.29	$ 3.19	$ 3.29
Diluted Earnings per Share
Net Income Attributable to DTE Energy Company	$ 182	$ 234	$ 583	$ 595
Less: Allocation of earnings to net restricted stock awards	0	0	1	1
Net income available to common shareholders — diluted	$ 182	$ 234	$ 582	$ 594
Average number of common shares outstanding — basic (in shares)	183.0	181.0	183.0	180.0
Incremental shares attributable to:
Average dilutive equity units, performance share awards, and stock options (in shares)	1.0	0.0	0.0	0.0
Average number of common shares outstanding — diluted (in shares)	184.0	181.0	183.0	180.0
Diluted Earnings per Common Share (in dollars per share)	$ 0.99	$ 1.29	$ 3.18	$ 3.29
Antidilutive securities excluded from computation of earnings per share (in shares)		6.6		6.6