Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Basic Earnings per Share
Net income attributable to DTE Energy Company	$ 177	$ 152	$ 577	$ 399
Less: Allocation of earnings to net restricted stock awards	0	0	1	1
Net income available to common shareholders — basic	$ 177	$ 152	$ 576	$ 398
Average number of common shares outstanding (in shares)	179	179	179	179
Basic Earnings per Common Share (in dollars per share)	$ 0.99	$ 0.84	$ 3.21	$ 2.22
Diluted Earnings per Share
Net income attributable to DTE Energy Company	$ 177	$ 152	$ 577	$ 399
Less: Allocation of earnings to net restricted stock awards	0	0	1	1
Net income available to common shareholders — diluted	$ 177	$ 152	$ 576	$ 398
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)	$ 0.99	$ 0.84	$ 3.21	$ 2.22