Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Revenues	$ 8,791	$ 8,858	$ 8,525
Operating Expenses
Fuel, purchased power and gas	3,296	3,537	3,190
Operation and maintenance	2,892	2,612	2,567
Depreciation, depletion and amortization	995	977	1,012
Taxes other than income	332	310	306
Asset (gains) and losses, reserves and impairments, net	(3)	1	(20)
Total operating expenses	7,512	7,437	7,055
Operating Income	1,279	1,421	1,470
Other (Income) and Deductions
Interest expense	440	488	543
Interest income	(10)	(10)	(12)
Other income	(173)	(117)	(78)
Other expenses	62	69	55
Total Other (Income) and Deductions	319	430	508
Income Before Income Taxes	960	991	962
Income Tax Expense	286	268	315
Income from Continuing Operations	674	723	647
Discontinued Operations (Loss), net of tax	(56.00)	(3.00)	(8.00)
Net Income	618	720	639
Less: Net Income Attributable to Noncontrolling Interests	8	9	9
Net Income Attributable to DTE Energy Company	$ 610	$ 711	$ 630
Basic Earnings per Common Share
Net Income Attributable to DTE Energy Company	$ 3.56	$ 4.19	$ 3.75
Income from continuing operations	$ 3.89	$ 4.21	$ 3.79
Discontinued operations	$ (0.33)	$ (0.02)	$ (0.04)
Diluted Earnings per Common Share
Net Income Attributable to DTE Energy Company	$ 3.55	$ 4.18	$ 3.74
Income from continuing operations	$ 3.88	$ 4.20	$ 3.78
Discontinued operations	$ (0.33)	$ (0.02)	$ (0.04)
Weighted Average Common Shares Outstanding
Basic	171	169	168
Diluted	172	170	169
Dividends Declared per Common Share	$ 2.42	$ 2.32	$ 2.18