Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Basic Earnings per Share
Net Income (Loss) Attributable to DTE Energy Company	$ 152	$ 109	$ 399	$ 382
Average number of common shares outstanding	179	179	179	179
Dividends declared — common shares	$ 131	$ 124	$ 261	$ 247
Dividends declared — net restricted shares	0	0	1	1
Total distributed earnings	131	124	262	248
Net Income less distributed earnings	$ 21	$ (15)	$ 137	$ 134
Distributed (dividends per common share) (dollars per share)	$ 0.73	$ 0.69	$ 1.46	$ 1.38
Undistributed (dollars per share)	0.11	(0.08)	0.76	0.75
Total Basic Earnings per Common Share (dollars per share)	$ 0.84	$ 0.61	$ 2.22	$ 2.13
Diluted Earnings per Share
Net Income (Loss) Attributable to DTE Energy Company	$ 152	$ 109	$ 399	$ 382
Average number of common shares outstanding	179	179	179	179
Average incremental shares from assumed exercise of options (in shares)	1	0	1	0
Common shares for dilutive calculation	180	179	180	179
Dividends declared — common shares	$ 131	$ 124	$ 261	$ 247
Dividends declared — net restricted shares	0	0	1	1
Total distributed earnings	131	124	262	248
Net Income less distributed earnings	$ 21	$ (15)	$ 137	$ 134
Distributed (dividends per common share) (dollars per share)	$ 0.73	$ 0.69	$ 1.46	$ 1.38
Undistributed (dollars per share)	0.11	(0.08)	0.76	0.75
Total Diluted Earnings per Common Share (dollars per share)	$ 0.84	$ 0.61	$ 2.22	$ 2.13