Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Statement of Other Comprehensive Income [Abstract]
Net Income	$ 147	$ 200	$ 305	$ 378
Other comprehensive income (loss), net of tax:
Benefit obligations, net of taxes of $1, $-, $3 and $1, respectively	3	1	6	2
Net unrealized gains on investments	0	0	1	0
Foreign currency translation, net of taxes of $-, $-, $- and $-, respectively	(1)	1	0	1
Comprehensive income	149	202	312	381
Less: Comprehensive income attributable to noncontrolling interests	1	(2)	3	0
Comprehensive income attributable to DTE Energy Company	$ 148	$ 204	$ 309	$ 381