Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net Income		$ 1,112	$ 834	$ 720
Net Income	$ 270	1,134	868	727
Other comprehensive income (loss), net of tax:
Benefit obligations, net of taxes		10	11	13
Net unrealized gains on derivatives during the period, net of taxes		1	0	0
Net unrealized gains on investments during the period, net of taxes		1	1	1
Foreign currency translation		1	0	(4)
Other comprehensive income		13	12	10
Comprehensive income		1,125	846	730
Less: Comprehensive loss attributable to noncontrolling interests		(22)	(34)	(7)
Comprehensive Income Attributable to DTE Energy Company/DTE Electric Company		1,147	880	737
DTE Electric
Net Income	219	601	622	544
Other comprehensive income (loss), net of tax:
Transfer of benefit obligations, net of taxes		0	0	27
Net unrealized gains on investments during the period, net of taxes		1	0	1
Other comprehensive income		1	0	28
Comprehensive Income Attributable to DTE Energy Company/DTE Electric Company		$ 602	$ 622	$ 572