Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Millions	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Statement of Income and Comprehensive Income [Abstract]
Net Income	$ 563	$ 483
Benefit obligations:
Benefit obligation, net of taxes of $2 and $3	5	6
Amounts reclassified to benefit obligations related to consolidation of VIEs (Note 1), net of taxes of $- and $5	0	10
Total Benefit obligations	5	16
Net unrealized gains (losses) on derivatives:
Other Comprehensive Income Unrealized gains and losses net of tax	0	1
Amounts reclassified to income, net of taxes of $- and $1	0	1
Net unrealized gains (losses) on derivatives	0	2
Net unrealized gains (losses) on investments:
Gains (losses) during the period, net of taxes of $- and $(6)	(1)	(11)
Amounts reclassified to benefit obligations related to consolidation of VIEs (Note 1), net of taxes of $- and $(5)	0	(10)
Net unrealized gains (losses) on investments	(1)	(21)
Foreign currency translation, net of taxes of $- and $-	(1)	0
Comprehensive income	566	480
Less: Comprehensive income attributable to noncontrolling interests	2	5
Comprehensive income attributable to DTE Energy Company	$ 564	$ 475