Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement of Income and Comprehensive Income [Abstract]
Net Income	$ 200	$ 230	$ 542	$ 535
Benefit obligations:
Benefit obligations, net of tax	(2)	(3)	(7)	(9)
Net unrealized gains (losses) on derivatives:
Net unrealized gains on investments during the period, net of taxes of $1, $—, $1 and $—	1	0	1	1
Foreign currency translation, net of taxes of $—, $1, $(1) and $1	1	1	(1)	1
Other Comprehensive income	4	4	7	11
Comprehensive income	204	234	549	546
Less: Comprehensive income attributable to noncontrolling interests	2	3	5	6
Comprehensive income attributable to DTE Energy Company	$ 202	$ 231	$ 544	$ 540