Earnings Per Share (Details) (USD $) In Millions, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Basic Earnings per Share
Net Income Attributable to DTE Energy Company	$ 202	$ 86	$ 378	$ 315
Average number of common shares outstanding	169	169	169	167
Weighted average net restricted shares outstanding	1	1	1	1
Dividends declared - common shares	99	89	194	177
Dividends declared - net restricted shares				1
Total distributed earnings	99	89	194	178
Net income less distributed earnings	103	(3)	184	137
Distributed (dividends per common share)	$ 0.59	$ 0.53	$ 1.15	$ 1.06
Undistributed	$ 0.60	$ (0.02)	$ 1.08	$ 0.82
Total Basic Earnings per Common Share	$ 1.19	$ 0.51	$ 2.23	$ 1.88
Diluted Earnings per Share
Net Income Attributable to DTE Energy Company	202	86	378	315
Average number of common shares outstanding	169	169	169	167
Average incremental shares from assumed exercise of options				1
Common shares for dilutive calculation	170	169	170	168
Weighted average net restricted shares outstanding	1	1	1	1
Dividends declared - common shares	99	89	194	177
Dividends declared - net restricted shares				1
Total distributed earnings	99	89	194	178
Net income less distributed earnings	$ 103	$ (3)	$ 184	$ 137
Distributed (dividends per common share)	$ 0.59	$ 0.53	$ 1.15	$ 1.06
Undistributed	$ 0.60	$ (0.02)	$ 1.08	$ 0.82
Total Diluted Earnings per Common Share	$ 1.19	$ 0.51	$ 2.23	$ 1.88
Stock Options [Member]
Earnings Per Share (Textuals) [Abstract]
Options to purchase shares of common stock			0.4	0.4