Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Basic Earnings per Share
Net Income Attributable to DTE Energy Company	$ 179	$ 277	$ 576	$ 617
Less: Allocation of earnings to net restricted stock awards	1	0	1	1
Net income available to common shareholders — basic	$ 178	$ 277	$ 575	$ 616
Average number of common shares outstanding — basic (in shares)	193.0	192.0	193.0	192.0
Basic Earnings per Common Share (in dollars per share)	$ 0.92	$ 1.44	$ 2.97	$ 3.20
Diluted Earnings per Share
Net Income Attributable to DTE Energy Company	$ 179	$ 277	$ 576	$ 617
Less: Allocation of earnings to net restricted stock awards	1	0	1	1
Net income available to common shareholders — diluted	$ 178	$ 277	$ 575	$ 616
Average number of common shares outstanding — basic (in shares)	193.0	192.0	193.0	192.0
Average dilutive equity units, performance share awards, and stock options (in shares)	1.0	1.0	1.0	0.0
Average number of common shares outstanding — diluted (in shares)	194.0	193.0	194.0	192.0
Diluted Earnings per Common Share (in dollars per share)	$ 0.92	$ 1.44	$ 2.97	$ 3.20
Antidilutive securities excluded from computation of earnings per share (in shares)	9.5	10.3	10.0	10.3