Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net Income	$ 911	$ 668	$ 618
Other comprehensive income (loss), net of tax:
Benefit obligations, net of taxes of $(9), $13 and $(1), respectively	(18)	22	(2)
Net unrealized gains on investments during the period, net of taxes of $1, $1 and $1, respectively	1	2	1
Foreign currency translation, net of taxes of $(2), $(1) and $—, respectively	(2)	(2)	1
Other comprehensive income	(19)	22	0
Comprehensive income	892	690	618
Less comprehensive income attributable to noncontrolling interests	6	7	8
Comprehensive income attributable to DTE Energy Company	$ 886	$ 683	$ 610