Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Statement of Income and Comprehensive Income [Abstract]
Net Income	$ 235	$ 158
Benefit obligations:
Benefit obligation, net of taxes of $1 and $2	3	3
Total Benefit obligations	3	3
Net unrealized gains (losses) on derivatives:
Gains during the period, net of taxes of $- and $-	0	1
Net unrealized gains (losses) on derivatives	0	1
Foreign currency translation, net of taxes of $- and $-	(1)	1
Comprehensive income	2	5
Comprehensive income	237	163
Less: Comprehensive income attributable to noncontrolling interests	1	2
Comprehensive income attributable to DTE Energy Company	$ 236	$ 161