Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Income and Comprehensive Income [Abstract]
Net Income	$ 157	$ 200	$ 610	$ 542
Other comprehensive income (loss), net of tax:
Benefit obligations, net of taxes of $1, $2, $2 and $4, respectively	2	2	3	7
Net unrealized gains on investments during the period, net of taxes of $—, $1, $— and $1, respectively	0	1	1	1
Foreign currency translation, net of taxes of $(1), $—, $(1) and $(1), respectively	(1)	1	(1)	(1)
Other Comprehensive Income (Loss), Net of Tax	1	4	3	7
Comprehensive income	158	204	613	549
Less: Comprehensive income attributable to noncontrolling interests	1	2	4	5
Comprehensive income attributable to DTE Energy Company	$ 157	$ 202	$ 609	$ 544