Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Basic Earnings per Share
Net income attributable to DTE Energy Company	$ 400	$ 247
Less allocation of earnings to net restricted stock awards	(1)	0
Net income available to common shareholders — basic	$ 399	$ 247
Average number of common shares outstanding, basic (in shares)	179	179
Basic earnings per common share (in dollars per share)	$ 2.23	$ 1.38
Diluted Earnings per Share
Net income attributable to DTE Energy Company	$ 400	$ 247
Less allocation of earnings to net restricted stock awards	(1)	0
Net income available to common shareholders — diluted	$ 399	$ 247
Average number of common shares outstanding, diluted (in shares)	179	180
Diluted earnings per common share (in dollars per share)	$ 2.23	$ 1.37