Earnings Per Share (Basic and Diluted Income Per Share Calculation) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Basic Earnings per Share
Net Income Attributable to DTE Energy Company — continuing operations	$ 394	$ 320
Less: Allocation of earnings to net restricted stock awards	1	0
Net income from continuing operations available to common shareholders — basic	393	320
Net Income Attributable to DTE Energy Company — discontinued operations	0	77
Net income available to common shareholders — basic	$ 393	$ 397
Average number of common shares outstanding — basic (in shares)	193.0	194.0
Income from continuing operations (in dollars per share)	$ 2.03	$ 1.65
Income from discontinued operations (in dollars per share)	0	0.40
Basic Earnings per Common Share (in dollars per share)	$ 2.03	$ 2.05
Diluted Earnings per Share
Net Income Attributable to DTE Energy Company — continuing operations	$ 394	$ 320
Less: Allocation of earnings to net restricted stock awards	1	0
Net income from continuing operations available to common shareholders — diluted	393	320
Net Income Attributable to DTE Energy Company — discontinued operations	0	77
Net income available to common shareholders — diluted	$ 393	$ 397
Average number of common shares outstanding — basic (in shares)	193.0	194.0
Average dilutive equity units and performance share awards (in shares)	1.0	0.0
Average number of common shares outstanding — diluted (in shares)	194.0	194.0
Income from continuing operations (in dollars per share)	$ 2.03	$ 1.65
Income from discontinued operations (in dollars per share)	0	0.40
Diluted Earnings per Common Share (in dollars per share)	$ 2.03	$ 2.05
Antidilutive securities excluded from computation of earnings per share (in shares)	10.7	10.3