Common Stock and Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Basic Earnings per Share
Net Income Attributable to DTE Energy Company	$ 267	$ 319	$ 182	$ 401	$ 191	$ 334	$ 234	$ 361	$ 1,169	$ 1,120	$ 1,134
Less: Allocation of earnings to net restricted stock awards									(2)	(2)	(2)
Net income available to common shareholders — basic									$ 1,167	$ 1,118	$ 1,132
Average number of common shares outstanding — basic (in shares)									185.0	181.0	179.0
Basic Earnings per Common Share (in dollars per share)	$ 1.40	$ 1.74	$ 0.99	$ 2.20	$ 1.05	$ 1.84	$ 1.29	$ 2.01	$ 6.32	$ 6.18	$ 6.32
Diluted Earnings per Share
Net Income Attributable to DTE Energy Company	$ 267	$ 319	$ 182	$ 401	$ 191	$ 334	$ 234	$ 361	$ 1,169	$ 1,120	$ 1,134
Less: Allocation of earnings to net restricted stock awards									(2)	(2)	(2)
Net income available to common shareholders — diluted									$ 1,167	$ 1,118	$ 1,132
Average number of common shares outstanding — diluted (in shares)									185.0	181.0	179.0
Diluted Earnings per Common Share (in dollars per share)	$ 1.40	$ 1.73	$ 0.99	$ 2.19	$ 1.05	$ 1.84	$ 1.29	$ 2.00	$ 6.31	$ 6.17	$ 6.32
Incremental common shares attributable to dilutive effect of equity units (in shares)									9.9	6.3	6.3