Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating Revenues	$ 8,897	$ 8,557	$ 8,014
Operating Expenses
Fuel, purchased power and gas	3,537	3,190	3,118
Operation and maintenance	2,628	2,578	2,372
Depreciation, depletion and amortization	995	1,027	1,020
Taxes other than income	313	308	275
Asset (gains) and losses, reserves and impairments, net	1	(10)	(20)
Total operating expenses	7,474	7,093	6,765
Operating Income	1,423	1,464	1,249
Other (Income) and Deductions
Interest expense	494	549	545
Interest income	(10)	(12)	(19)
Other income	(117)	(78)	(102)
Other expenses	69	55	43
Total Other (Income) and Deductions	436	514	467
Income Before Income Taxes	987	950	782
Income Tax Expense	267	311	247
Net Income	720	639	535
Less: Net Income Attributable to Noncontrolling Interests	9	9	3
Net Income Attributable to DTE Energy Company	$ 711	$ 630	$ 532
Basic Earnings per Common Share
Net Income Attributable to DTE Energy Company	$ 4.19	$ 3.75	$ 3.24
Diluted Earnings per Common Share
Net Income Attributable to DTE Energy Company	$ 4.18	$ 3.74	$ 3.24
Weighted Average Common Shares Outstanding
Basic	169	168	164
Diluted	170	169	164
Dividends Declared per Common Share	$ 2.32	$ 2.18	$ 2.12