Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024
Basic Earnings per Share
Net Income Attributable to DTE Energy Company	$ 419	$ 229	$ 445	$ 477	$ 322	$ 313	$ 1,093	$ 1,112
Less: Allocation of earnings to net restricted stock awards	1			2			3	3
Net income available to common shareholders — basic	$ 418			$ 475			$ 1,090	$ 1,109
Average number of common shares outstanding — basic (in shares)	207			207			207	207
Basic Earnings per Common Share (in dollars per share)	$ 2.02			$ 2.30			$ 5.26	$ 5.37
Diluted Earnings per Share
Net Income Attributable to DTE Energy Company	$ 419	$ 229	$ 445	$ 477	$ 322	$ 313	$ 1,093	$ 1,112
Less: Allocation of earnings to net restricted stock awards	1			2			3	3
Net income available to common shareholders — diluted	$ 418			$ 475			$ 1,090	$ 1,109
Average number of common shares outstanding — diluted (in shares)	207			207			207	207
Diluted Earnings per Common Share (in dollars per share)	$ 2.01			$ 2.30			$ 5.26	$ 5.36