Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Operating Revenues	$ 12,301	$ 9,661	$ 8,791
Operating Expenses
Fuel, purchased power and gas	5,879	4,055	3,296
Operation and maintenance	3,347	2,978	2,892
Depreciation, depletion and amortization	1,145	1,094	995
Taxes other than income	352	340	332
Asset (gains) losses and impairments, net	(12)	(9)	(3)
Total operating expenses	10,711	8,458	7,512
Operating Income	1,590	1,203	1,279
Other (Income) and Deductions
Interest expense	429	436	440
Interest income	(10)	(9)	(10)
Other income	(196)	(201)	(173)
Other expenses	92	55	62
Total Other (Income) and Deductions	315	281	319
Income Before Income Taxes	1,275	922	960
Income Tax Expense	364	254	286
Income from Continuing Operations	911	668	674
Loss from Discontinued Operations, net of tax	0	0	(56)
Net Income	911	668	618
Less: Net Income Attributable to Noncontrolling Interests	6	7	8
Net Income Attributable to DTE Energy Company	$ 905	$ 661	$ 610
Basic Earnings per Common Share
Income from continuing operations (in dollars per share)	$ 5.11	$ 3.76	$ 3.89
Loss from discontinued operations, net of tax (in dollars per share)	$ 0	$ 0	$ (0.33)
Total (in dollars per share)	$ 5.11	$ 3.76	$ 3.56
Diluted Earnings per Common Share
Income from continuing operations (in dollars per share)	$ 5.10	$ 3.76	$ 3.88
Loss from discontinued operations, net of tax (in dollars per share)	$ 0	$ 0	$ (0.33)
Total (in dollars per share)	$ 5.10	$ 3.76	$ 3.55
Weighted Average Common Shares Outstanding
Basic (in shares)	177	175	171
Diluted (in shares)	177	175	172
Dividends Declared per Common Share	$ 2.69	$ 2.59	$ 2.42