Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Revenues
Utility operations	$ 6,238	$ 6,884	$ 6,643
Non-utility operations	4,099	5,417	3,018
Operating Revenues	10,337	12,301	9,661
Operating Expenses
Fuel, purchased power, and gas — utility	2,081	2,407	2,281
Fuel, purchased power, and gas — non-utility	3,481	4,615	2,544
Operation and maintenance	2,214	2,204	2,208
Depreciation and amortization	852	1,145	1,094
Taxes other than income	364	352	340
Asset (gains) losses and impairments, net	106	(12)	(9)
Total operating expenses	9,098	10,711	8,458
Operating Income	1,239	1,590	1,203
Other (Income) and Deductions
Interest expense	450	429	436
Interest income	(13)	(10)	(9)
Other income	(209)	(196)	(201)
Other expenses	61	92	55
Total Other (Income) and Deductions	289	315	281
Income Before Income Taxes	950	1,275	922
Income Tax Expense (Benefit)	230	364	254
Net Income	720	911	668
Less: Net Income (Loss) Attributable to Noncontrolling Interests	(7)	6	7
Net Income	$ 727	$ 905	$ 661
Basic Earnings per Common Share
Net Income Attributable to DTE Energy Company (in dollars per share)	$ 4.05	$ 5.11	$ 3.76
Diluted Earnings per Common Share
Net Income Attributable to DTE Energy Company (in dollars per share)	$ 4.05	$ 5.10	$ 3.76
Weighted Average Common Shares Outstanding
Basic (in shares)	179	177	175
Diluted (in shares)	179	177	175
Dividends Declared per Common Share	$ 2.84	$ 2.69	$ 2.59
DTE Electric
Operating Revenues
Operating Revenues	$ 4,900	$ 5,282	$ 5,197
Operating Expenses
Fuel, purchased power, and gas — utility	1,574	1,706	1,668
Operation and maintenance	1,342	1,331	1,376
Depreciation and amortization	633	927	896
Taxes other than income	277	267	260
Asset (gains) losses and impairments, net	0	(1)	(3)
Total operating expenses	3,826	4,230	4,197
Operating Income	1,074	1,052	1,000
Other (Income) and Deductions
Interest expense	258	250	268
Interest income	0	(1)	0
Other income	(60)	(62)	(54)
Other expenses	40	35	45
Total Other (Income) and Deductions	238	222	259
Income Before Income Taxes	836	830	741
Income Tax Expense (Benefit)	292	298	254
Net Income	$ 544	$ 532	$ 487