Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2026	Jun. 30, 2026	Mar. 31, 2026	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2026	Sep. 30, 2025
Basic Earnings per Share
Net Income Attributable to DTE Energy Company	$ 470	$ 282	$ 247	$ 419	$ 229	$ 445	$ 999	$ 1,093
Less: Allocation of earnings to net restricted stock awards	1			1			3	3
Net income available to common shareholders — basic	$ 469			$ 418			$ 996	$ 1,090
Average number of common shares outstanding — basic (in shares)	208			207			208	207
Basic Earnings per Common Share (in dollars per share)	$ 2.26			$ 2.02			$ 4.80	$ 5.26
Diluted Earnings per Share
Net Income Attributable to DTE Energy Company	$ 470	$ 282	$ 247	$ 419	$ 229	$ 445	$ 999	$ 1,093
Less: Allocation of earnings to net restricted stock awards	1			1			3	3
Net income available to common shareholders — diluted	$ 469			$ 418			$ 996	$ 1,090
Average number of common shares outstanding — basic (in shares)	208			207			208	207
Average number of common shares outstanding — diluted (in shares)	208			207			208	207
Diluted Earnings per Common Share (in dollars per share)	$ 2.25			$ 2.01			$ 4.79	$ 5.26