Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Basic Earnings per Share
Net Income Attributable to DTE Energy Company	$ 275	$ 476	$ 277	$ 340	$ 267	$ 319	$ 182	$ 401	$ 1,368	$ 1,169	$ 1,120
Less: Allocation of earnings to net restricted stock awards									(2)	(2)	(2)
Net income available to common shareholders — basic									$ 1,366	$ 1,167	$ 1,118
Average number of common shares outstanding — basic (in shares)									193.0	185.0	181.0
Basic Earnings per Common Share (in dollars per share)	$ 1.42	$ 2.47	$ 1.44	$ 1.77	$ 1.40	$ 1.74	$ 0.99	$ 2.20	$ 7.09	$ 6.32	$ 6.18
Diluted Earnings per Share
Net Income Attributable to DTE Energy Company	$ 275	$ 476	$ 277	$ 340	$ 267	$ 319	$ 182	$ 401	$ 1,368	$ 1,169	$ 1,120
Less: Allocation of earnings to net restricted stock awards									(2)	(2)	(2)
Net income available to common shareholders — diluted									$ 1,366	$ 1,167	$ 1,118
Average number of common shares outstanding — diluted (in shares)									193.0	185.0	181.0
Diluted Earnings per Common Share (in dollars per share)	$ 1.42	$ 2.46	$ 1.44	$ 1.76	$ 1.40	$ 1.73	$ 0.99	$ 2.19	$ 7.08	$ 6.31	$ 6.17
Incremental common shares attributable to dilutive effect of equity units (in shares)									10.3	10.3	6.3