Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Statement of Other Comprehensive Income [Abstract]
Net Income	$ 230	$ 185	$ 535	$ 563
Other comprehensive income (loss), net of tax:
Benefit obligations, net of taxes of $1, $1, $4 and $2, respectively	3	3	9	5
Net unrealized gains on investments, net of taxes of $- $-, $- and $-, respectively	0	(1)	1	(1)
Foreign currency translation, net of taxes of $1, $-, $1 and $-, respectively	1	(2)	1	(1)
Comprehensive income	234	185	546	566
Less: Comprehensive income attributable to noncontrolling interests	3	2	6	2
Comprehensive income attributable to DTE Energy Company	$ 231	$ 183	$ 540	$ 564