Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Tax effect on benefit obligation	$ 6	$ 8	$ (9)
Tax effect on net unrealized gains (losses) on investments during the period	1	0	1
DTE Electric
Transfer of benefit obligations, net of taxes amounts		18
Tax effect on benefit obligation			(4)
Tax effect on net unrealized gains (losses) on investments during the period	$ 0	$ 0	$ 0