Consolidated Statements of Comprehensive Income (Parentheticals) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Tax effect on benefit obligation	$ 2	$ 1	$ 4	$ 1
Tax effect on net unrealized gains on investments	0	0	0	0
DTE Electric
Tax effect on benefit obligation - transfer	0	0	18	0
Tax effect on benefit obligation	$ 0	$ 1	$ 0	$ 0