Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Basic Earnings per Share
Net Income Attributable to DTE Energy Company	$ 277	$ 182	$ 617	$ 583
Less: Allocation of earnings to net restricted stock awards	0	0	1	1
Net income available to common shareholders — basic	$ 277	$ 182	$ 616	$ 582
Average number of common shares outstanding — basic (in shares)	192.0	183.0	192.0	183.0
Basic Earnings per Common Share (in dollars per share)	$ 1.44	$ 0.99	$ 3.20	$ 3.19
Diluted Earnings per Share
Net Income Attributable to DTE Energy Company	$ 277	$ 182	$ 617	$ 583
Less: Allocation of earnings to net restricted stock awards	0	0	1	1
Net income available to common shareholders — diluted	$ 277	$ 182	$ 616	$ 582
Average number of common shares outstanding — basic (in shares)	192.0	183.0	192.0	183.0
Incremental shares attributable to:
Average dilutive equity units, performance share awards, and stock options (in shares)	1.0	1.0	0.0	0.0
Average number of common shares outstanding — diluted (in shares)	193.0	184.0	192.0	183.0
Diluted Earnings per Common Share (in dollars per share)	$ 1.44	$ 0.99	$ 3.20	$ 3.18
Antidilutive securities excluded from computation of earnings per share (in shares)	10.3		10.3