Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Basic Earnings per Share
Net Income (Loss) Attributable to DTE Energy Company	$ 338	$ 265	$ 737	$ 647
Average number of common shares outstanding (in shares)	179	179	179	179
Dividends declared — common shares	$ 138	$ 131	$ 399	$ 378
Dividends declared — net restricted shares	0	0	1	1
Total distributed earnings	138	131	400	379
Net Income less distributed earnings	$ 200	$ 134	$ 337	$ 268
Distributed (dividends per common share) (dollars per share)	$ 0.77	$ 0.73	$ 2.23	$ 2.11
Undistributed (dollars per share)	1.11	0.74	1.87	1.50
Total Basic Earnings per Common Share (dollars per share)	$ 1.88	$ 1.47	$ 4.10	$ 3.61
Diluted Earnings per Share
Net Income (Loss) Attributable to DTE Energy Company	$ 338	$ 265	$ 737	$ 647
Average number of common shares outstanding (in shares)	179	180	179	179
Average incremental shares from assumed exercise of options (in shares)	1	0	1	0
Common shares for dilutive calculation (in shares)	180	180	180	179
Dividends declared — common shares	$ 138	$ 131	$ 399	$ 378
Dividends declared — net restricted shares	0	0	1	1
Total distributed earnings	138	131	400	379
Net Income less distributed earnings	$ 200	$ 134	$ 337	$ 268
Distributed (dividends per common share) (dollars per share)	$ 0.77	$ 0.73	$ 2.23	$ 2.11
Undistributed (dollars per share)	1.11	0.74	1.87	1.50
Total Diluted Earnings per Common Share (dollars per share)	$ 1.88	$ 1.47	$ 4.10	$ 3.61