Consolidated Statements of Comprehensive Income (Parentheticals) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Tax effect on benefit obligation	$ 2	$ 1	$ 6	$ 2
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	$ 0	$ 0	$ 0