Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Basic Earnings per Share
Net Income Attributable to DTE Energy Company	$ 477	$ 332	$ 1,112	$ 978
Less: Allocation of earnings to net restricted stock awards	2	0	3	2
Net income available to common shareholders — basic	$ 475	$ 332	$ 1,109	$ 976
Average number of common shares outstanding — basic (in shares)	207	206	207	206
Basic Earnings per Common Share (in dollars per share)	$ 2.30	$ 1.61	$ 5.37	$ 4.74
Diluted Earnings per Share
Net Income Attributable to DTE Energy Company	$ 477	$ 332	$ 1,112	$ 978
Less: Allocation of earnings to net restricted stock awards	2	0	3	2
Net income available to common shareholders — diluted	$ 475	$ 332	$ 1,109	$ 976
Average number of common shares outstanding — basic (in shares)	207	206	207	206
Average performance share awards (in shares)	0	0	0	0
Average number of common shares outstanding — diluted (in shares)	207	206	207	206
Diluted Earnings per Common Share (in dollars per share)	$ 2.30	$ 1.61	$ 5.36	$ 4.74