Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Income and Comprehensive Income [Abstract]
Net Income	$ 126	$ 107	$ 453	$ 342
Other comprehensive income (loss), net of tax:
Benefit obligations, net of taxes of $1, $1, $1 and $2, respectively	1	2	1	5
Net unrealized gains on investments during the period, net of taxes of $—, $—, $— and $—, respectively	1	0	1	0
Foreign currency translation, net of taxes of $1, $(1), $— and $(1), respectively	1	(1)	0	(2)
Other Comprehensive Income (Loss), Net of Tax	3	1	2	3
Comprehensive income	129	108	455	345
Less: Comprehensive income attributable to noncontrolling interests	2	2	3	3
Comprehensive income attributable to DTE Energy Company	$ 127	$ 106	$ 452	$ 342