Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Basic Earnings per Share
Net Income (Loss) Attributable to DTE Energy Company	$ 247	$ 273
Average number of common shares outstanding (in shares)	179	178
Dividends declared — common shares	$ 131	$ 123
Dividends declared — net restricted shares	0	1
Total distributed earnings	131	124
Net Income less distributed earnings	$ 116	$ 149
Distributed (dividends per common share) (dollars per share)	$ 0.73	$ 0.69
Undistributed (dollars per share)	0.65	0.84
Total Basic Earnings per Common Share (dollars per share)	$ 1.38	$ 1.53
Diluted Earnings per Share
Net Income (Loss) Attributable to DTE Energy Company	$ 247	$ 273
Average number of common shares outstanding (in shares)	180	178
Dividends declared — common shares	$ 131	$ 123
Dividends declared — net restricted shares	0	1
Total distributed earnings	131	124
Net Income less distributed earnings	$ 116	$ 149
Distributed (dividends per common share) (dollars per share)	$ 0.73	$ 0.69
Undistributed (dollars per share)	0.64	0.84
Total Diluted Earnings per Common Share (dollars per share)	$ 1.37	$ 1.53