Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net Income	$ 265	$ 727	$ 905	$ 661
Net Income		720	911	668
Other comprehensive income (loss), net of tax:
Benefit obligations, net of taxes of $8, $(9), and $13, respectively DTE Electric $(4), $4 for 2014 and 2013 respectively		13	(18)	22
Net unrealized gains on investments during the period, net of taxes of $—, $1, and $1, respectively DTE Electric $--, $--, and $--, respectively		1	1	2
Foreign currency translation		(4)	(2)	(2)
Net current-period Other comprehensive income (loss)		10	(19)	22
Comprehensive income		730	892	690
Less comprehensive income (loss) attributable to noncontrolling interests		(7)	6	7
Comprehensive income attributable to DTE Energy Company		737	886	683
DTE Electric
Net Income	$ 216	544	532	487
Other comprehensive income (loss), net of tax:
Transfer of benefit obligations, net of taxes of $18 in 2015		27	0	0
Benefit obligations, net of taxes of $8, $(9), and $13, respectively DTE Electric $(4), $4 for 2014 and 2013 respectively		0	(10)	5
Net unrealized gains on investments during the period, net of taxes of $—, $1, and $1, respectively DTE Electric $--, $--, and $--, respectively		1	0	1
Net current-period Other comprehensive income (loss)		28	(10)	6
Comprehensive income attributable to DTE Energy Company		$ 572	$ 522	$ 493