Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Basic Earnings per Share
Net Income Attributable to DTE Energy Company/DTE Electric	$ 265	$ 156	$ 647	$ 606
Average number of common shares outstanding (in shares)	179	177	179	177
Dividends declared — common shares	$ 131	$ 122	$ 378	$ 353
Dividends declared — net restricted shares	0	0	1	1
Total distributed earnings	131	122	379	354
Net Income less distributed earnings	$ 134	$ 34	$ 268	$ 252
Distributed (dividends per common share) (dollars per share)	$ 0.73	$ 0.69	$ 2.11	$ 2.00
Undistributed (in dollars per share)	0.74	0.19	1.50	1.42
Total Basic Earnings per Common Share (dollars per share)	$ 1.47	$ 0.88	$ 3.61	$ 3.42
Diluted Earnings per Share
Net Income Attributable to DTE Energy Company/DTE Electric	$ 265	$ 156	$ 647	$ 606
Average number of common shares outstanding (in shares)	180	177	179	177
Dividends declared — common shares	$ 131	$ 122	$ 378	$ 353
Dividends declared — net restricted shares	0	0	1	1
Total distributed earnings	131	122	379	354
Net Income less distributed earnings	$ 134	$ 34	$ 268	$ 252
Distributed (dividends per common share) (dollars per share)	$ 0.73	$ 0.69	$ 2.11	$ 2.00
Undistributed (dollars per share)	0.74	0.19	1.50	1.42
Total Diluted Earnings per Common Share (dollars per share)	$ 1.47	$ 0.88	$ 3.61	$ 3.42