Supplementary Quarterly Financial Information (Unaudited ) (Tables)

12 Months Ended

Dec. 31, 2011

Supplementary Quarterly Financial Information (Unaudited) [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

	First Quarter		Second Quarter		Third Quarter		Fourth Quarter		Year
	(In millions, except per share amounts)
2011
Operating Revenues	$	2,431	$	2,028	$	2,265	$	2,173	$	8,897
Operating Income	$	390	$	288	$	399	$	346	$	1,423
Net Income Attributable to DTE Energy Company (1)	$	176	$	202	$	183	$	150	$	711
Basic Earnings per Share	$	1.04	$	1.19	$	1.08	$	.88	$	4.19
Diluted Earnings per Share	$	1.04	$	1.19	$	1.07	$	.88	$	4.18

2010
Operating Revenues	$	2,453	$	1,792	$	2,139	$	2,173	$	8,557
Operating Income	$	472	$	256	$	386	$	350	$	1,464
Net Income Attributable to DTE Energy Company	$	229	$	86	$	163	$	152	$	630
Basic Earnings per Share	$	1.38	$	.51	$	.97	$	.90	$	3.75
Diluted Earnings per Share	$	1.38	$	.51	$	.96	$	.90	$	3.74