Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Basic Earnings per Share
Net Income Attributable to DTE Energy Company	$ 198	$ 227	$ 537	$ 529
Average number of common shares outstanding	175	172	174	171
Weighted average net restricted shares outstanding	0	1	1	1
Dividends declared on common stock	115	106	337	307
Dividends declared - net restricted shares	1	1	1	2
Total distributed earnings	116	107	338	309
Net income less distributed earnings	82	120	199	220
Distributed (dividends per common share)	$ 0.66	$ 0.62	$ 1.93	$ 1.80
Undistributed	$ 0.47	$ 0.70	$ 1.14	$ 1.29
Total Basic Earnings per Common Share	$ 1.13	$ 1.32	$ 3.07	$ 3.09
Diluted Earnings per Share
Net Income Attributable to DTE Energy Company	198	227	537	529
Average number of common shares outstanding	175	172	174	171
Average incremental shares from assumed exercise of options	0	0	0	0
Common shares for dilutive calculation	176	172	175	171
Weighted average net restricted shares outstanding	0	1	1	1
Dividends declared on common stock	115	106	337	307
Dividends declared - net restricted shares	1	1	1	2
Total distributed earnings	116	107	338	309
Net income less distributed earnings	$ 82	$ 120	$ 199	$ 220
Distributed (dividends per common share)	$ 0.66	$ 0.62	$ 1.93	$ 1.80
Undistributed	$ 0.47	$ 0.69	$ 1.14	$ 1.28
Total Diluted Earnings per Common Share	$ 1.13	$ 1.31	$ 3.07	$ 3.08