Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Basic Earnings per Share
Net Income Attributable to DTE Energy Company	$ 476	$ 319	$ 1,093	$ 902
Less: Allocation of earnings to net restricted stock awards	1	1	2	2
Net income available to common shareholders — basic	$ 475	$ 318	$ 1,091	$ 900
Average number of common shares outstanding — basic (in shares)	193.0	183.0	192.0	183.0
Basic Earnings per Common Share (in dollars per share)	$ 2.47	$ 1.74	$ 5.67	$ 4.93
Diluted Earnings per Share
Net Income Attributable to DTE Energy Company	$ 476	$ 319	$ 1,093	$ 902
Less: Allocation of earnings to net restricted stock awards	1	1	2	2
Net income available to common shareholders — diluted	$ 475	$ 318	$ 1,091	$ 900
Average number of common shares outstanding — basic (in shares)	193.0	183.0	192.0	183.0
Incremental shares attributable to:
Average dilutive equity units, performance share awards, and stock options (in shares)	0.0	1.0	1.0	1.0
Average number of common shares outstanding — diluted (in shares)	193.0	184.0	193.0	184.0
Diluted Earnings per Common Share (in dollars per share)	$ 2.46	$ 1.73	$ 5.66	$ 4.91
Antidilutive securities excluded from computation of earnings per share (in shares)	10.3		10.3