Supplementary Quarterly Financial Information (Unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Quarterly Information [Line Items]
Operating Revenues	$ 2,173	$ 2,265	$ 2,028	$ 2,431	$ 2,173	$ 2,139	$ 1,792	$ 2,453	$ 8,897	$ 8,557	$ 8,014
Operating Income (Loss)	346	399	288	390	350	386	256	472	1,423	1,464	1,249
Net Income Attributable to DTE Energy Company	150	183	202	176	152	163	86	229	711	630	532
Basic Earnings per Share	$ 0.88	$ 1.08	$ 1.19	$ 1.04	$ 0.90	$ 0.97	$ 0.51	$ 1.38	$ 4.19	$ 3.75	$ 3.24
Diluted Earnings per Share	$ 0.88	$ 1.07	$ 1.19	$ 1.04	$ 0.90	$ 0.96	$ 0.51	$ 1.38	$ 4.18	$ 3.74	$ 3.24
Income Tax Benefit			$ 87