Segment Information (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Inter-segment billing for goods and services
Revenue Total	$ 81	$ 85	$ 123	$ 100
Financial data of the business segments
Operating Revenues	2,028	1,792	4,459	4,245
Net Income Attributable to DTE Energy Company	202	86	378	315
Segment Information (Textuals) [Abstract]
Number of Detroit Edison Customers			approximately 2.1 million
Number of MichCon Customers			approximately 1.2 million
Number of Citizens Gas customers			approximately 17,000
Gas Utility [Member]
Inter-segment billing for goods and services
Revenue Total	1	(1)	1
Financial data of the business segments
Operating Revenues	242	232	931	987
Net Income Attributable To DTE Energy Company	(3)	19	80	98
Electric Utility [Member]
Inter-segment billing for goods and services
Revenue Total	9	9	18	15
Financial data of the business segments
Operating Revenues	1,240	1,208	2,433	2,354
Net Income Attributable To DTE Energy Company	103	87	188	178
Gas Storage and Pipelines [Member]
Inter-segment billing for goods and services
Revenue Total	4	1	6	2
Financial data of the business segments
Operating Revenues	23	21	48	42
Net Income Attributable To DTE Energy Company	14	10	29	24
Unconventional Gas Production [Member]
Financial data of the business segments
Operating Revenues	10	8	18	16
Net Income Attributable To DTE Energy Company	(1)	(2)	(3)	(5)
Power and Industrial Projects [Member]
Inter-segment billing for goods and services
Revenue Total	63	70	89	72
Financial data of the business segments
Operating Revenues	287	291	522	543
Net Income Attributable To DTE Energy Company	5	22	15	40
Energy Trading [Member]
Inter-segment billing for goods and services
Revenue Total	15	18	37	44
Financial data of the business segments
Operating Revenues	306	117	628	403
Net Income Attributable To DTE Energy Company	12	(26)	14	12
Corporate & Other [Member]
Inter-segment billing for goods and services
Revenue Total	(11)	(12)	(28)	(33)
Financial data of the business segments
Operating Revenues	1		2
Net Income Attributable To DTE Energy Company	72	(24)	55	(32)
Income tax benefit related to the enactment of the MCIT			88
Reconciliation and Eliminations [Member]
Financial data of the business segments
Operating Revenues	(81)	(85)	(123)	(100)
Net Income Attributable To DTE Energy Company	$ 0		$ 0