Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Income and Comprehensive Income [Abstract]
Net Income	$ 618	$ 720	$ 639
Benefit obligations:
Benefit obligation, net of taxes of $(1), $(5) and $3	(2)	(9)	5
Amounts reclassified to benefit obligations related to consolidation of VIEs (Note 1), net of taxes of $-, $- and $5	0	0	10
Total Benefit obligations	(2)	(9)	15
Net unrealized gains (losses) on derivatives:
Gains during the period, net of taxes of $-, $- and $1	0	0	1
Amounts reclassified to income, net of taxes of $-, $- and $1	0	0	1
Net unrealized gains (losses) on derivatives	0	0	2
Net unrealized gains (losses) on investments:
Gains (losses) during the period, net of taxes of $1, $- and $(6)	1	0	(10)
Amounts reclassified to benefit obligations related to consolidation of VIEs (Note 1), net of taxes of $-, $- and $(5)	0	0	(10)
Net unrealized gains (losses) on investments	1	0	(20)
Foreign currency translation, net of taxes of $-, $- and $-	1	0	1
Comprehensive income	0	(9)	(2)
Comprehensive income	618	711	637
Less: Comprehensive income attributable to noncontrolling interests	8	9	9
Comprehensive income attributable to DTE Energy Company	$ 610	$ 702	$ 628