Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Basic Earnings per Share
Net Income Attributable to DTE Energy Company	$ 270	$ 338	$ 847	$ 737
Less: Allocation of earnings to net restricted stock awards	1	0	2	1
Net income available to common shareholders — basic	$ 269	$ 338	$ 845	$ 736
Average number of common shares outstanding (in shares)	179	179	179	179
Basic Earnings per Common Share (in dollars per share)	$ 1.51	$ 1.88	$ 4.72	$ 4.10
Diluted Earnings per Share
Net Income Attributable to DTE Energy Company	$ 270	$ 338	$ 847	$ 737
Less: Allocation of earnings to net restricted stock awards	1	0	2	1
Net income available to common shareholders — diluted	$ 269	$ 338	$ 845	$ 736
Average number of common shares outstanding (in shares)	179	179	179	179
Incremental shares attributable to:
Average dilutive performance share awards and stock options (in shares)	0	1	0	1
Average number of common shares outstanding - diluted (in shares)	179	180	179	180
Diluted Earnings per Common Share (in dollars per share)	$ 1.51	$ 1.88	$ 4.72	$ 4.10