Earnings Per Share (Basic and Diluted Income Per Share Calculation) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Basic Earnings per Share
Net Income Attributable to DTE Energy Company — continuing operations	$ 37	$ 117	$ 431	$ 437
Less: Allocation of earnings to net restricted stock awards	0	1	1	1
Net income from continuing operations available to common shareholders — basic	37	116	430	436
Net Income Attributable to DTE Energy Company — discontinued operations	0	62	0	139
Net income available to common shareholders — basic	$ 37	$ 178	$ 430	$ 575
Average number of common shares outstanding — basic (in shares)	193.0	193.0	193.0	193.0
Income from continuing operations (in dollars per share)	$ 0.19	$ 0.60	$ 2.22	$ 2.25
Income from discontinued operations (in dollars per share)	0	0.32	0	0.72
Basic Earnings per Common Share (in dollars per share)	$ 0.19	$ 0.92	$ 2.22	$ 2.97
Diluted Earnings per Share
Net Income Attributable to DTE Energy Company — continuing operations	$ 37	$ 117	$ 431	$ 437
Less: Allocation of earnings to net restricted stock awards	0	1	1	1
Net income from continuing operations available to common shareholders — diluted	37	116	430	436
Net Income Attributable to DTE Energy Company — discontinued operations	0	62	0	139
Net income available to common shareholders — diluted	$ 37	$ 178	$ 430	$ 575
Average number of common shares outstanding — basic (in shares)	193.0	193.0	193.0	193.0
Average dilutive equity units and performance share awards (in shares)	1.0	1.0	1.0	1.0
Average number of common shares outstanding — diluted (in shares)	194.0	194.0	194.0	194.0
Income from continuing operations (in dollars per share)	$ 0.19	$ 0.60	$ 2.22	$ 2.25
Income from discontinued operations (in dollars per share)	0	0.32	0	0.72
Diluted Earnings per Common Share (in dollars per share)	$ 0.19	$ 0.92	$ 2.22	$ 2.97
Antidilutive securities excluded from computation of earnings per share (in shares)	10.0	9.5	10.3	10.0