Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Revenues
Utility operations	$ 6,434	$ 6,497	$ 6,238
Non-utility operations	6,173	4,133	4,099
Operating Revenues	12,607	10,630	10,337
Operating Expenses
Fuel, purchased power, and gas — utility	1,881	1,968	2,081
Fuel, purchased power, and gas — non-utility	5,283	3,562	3,481
Operation and maintenance	2,335	2,302	2,214
Depreciation and amortization	1,030	976	852
Taxes other than income	391	370	364
Asset (gains) losses and impairments, net	(41)	(7)	(106)
Operating Expenses	10,961	9,185	9,098
Operating Income	1,646	1,445	1,239
Other (Income) and Deductions
Interest expense	536	472	450
Interest income	(12)	(20)	(13)
Other income	(268)	(207)	(209)
Other expenses	103	95	61
Other (Income) and Deductions	359	340	289
Income Before Income Taxes	1,287	1,105	950
Income Tax Expense	175	271	230
Net Income	1,112	834	720
Less: Net Loss Attributable to Noncontrolling Interests	(22)	(34)	(7)
Net Income Attributable to DTE Energy Company/DTE Electric Company	$ 1,134	$ 868	$ 727
Basic Earnings per Common Share
Net income attributable to DTE Energy Company (in dollars per share)	$ 6.32	$ 4.84	$ 4.05
Diluted Earnings per Common Share
Net income attributable to DTE Energy Company (in dollars per share)	$ 6.32	$ 4.83	$ 4.05
Weighted Average Common Shares Outstanding
Basic (in shares)	179	179	179
Diluted (in shares)	179	179	179
Dividends Declared per Common Share	$ 3.36	$ 3.06	$ 2.84
DTE Electric
Operating Revenues
Utility operations	$ 5,102	$ 5,225	$ 4,900
Operating Revenues	5,102	5,225
Operating Expenses
Fuel and purchased power — utility	1,454	1,532	1,574
Operation and maintenance	1,428	1,455	1,342
Depreciation and amortization	753	750	633
Taxes other than income	302	284	277
Operating Expenses	3,937	4,021	3,826
Operating Income	1,165	1,204	1,074
Other (Income) and Deductions
Interest expense	274	264	258
Interest income	0	(8)	0
Other income	(77)	(61)	(60)
Other expenses	40	34	40
Other (Income) and Deductions	237	229	238
Income Before Income Taxes	928	975	836
Income Tax Expense	327	353	292
Net Income Attributable to DTE Energy Company/DTE Electric Company	$ 601	$ 622	$ 544