Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Revenues
Utility operations	$ 6,845	$ 6,638	$ 6,670
Non-utility operations	5,332	6,031	7,542
Operating Revenues	12,177	12,669	14,212
Operating Expenses
Fuel, purchased power, and gas — utility	1,719	1,798	1,981
Fuel, purchased power, gas, and other — non-utility	4,141	5,053	6,630
Operation and maintenance	2,443	2,419	2,451
Depreciation and amortization	1,443	1,263	1,124
Taxes other than income	410	414	405
Asset (gains) losses and impairments, net	35	15	27
Operating Expenses	10,191	10,962	12,618
Operating Income	1,986	1,707	1,594
Other (Income) and Deductions
Interest expense	720	641	559
Interest income	(38)	(17)	(12)
Non-operating retirement benefits, net	50	39	37
Other income	(388)	(350)	(333)
Other expenses	104	70	127
Other (Income) and Deductions	448	383	378
Income Before Income Taxes	1,538	1,324	1,216
Income Tax Expense	167	152	98
Net Income	1,371	1,172	1,118
Less: Net Income (Loss) Attributable to Noncontrolling Interests	3	3	(2)
Net Income Attributable to DTE Energy Company/DTE Electric Company	$ 1,368	$ 1,169	$ 1,120
Basic Earnings per Common Share
Net income attributable to DTE Energy Company (in dollars per share)	$ 7.09	$ 6.32	$ 6.18
Diluted Earnings per Common Share
Net income attributable to DTE Energy Company (in dollars per share)	$ 7.08	$ 6.31	$ 6.17
Weighted Average Common Shares Outstanding
Basic (in shares)	193	185	181
Diluted (in shares)	193	185	181
DTE Electric
Operating Revenues
Utility operations	$ 5,506	$ 5,224	$ 5,298
Operating Revenues	5,506	5,224
Operating Expenses
Fuel, purchased power, and gas — utility	1,397	1,390	1,552
Operation and maintenance	1,505	1,452	1,470
Depreciation and amortization	1,043	946	836
Taxes other than income	296	310	307
Asset (gains) losses and impairments, net	41	13	(1)
Operating Expenses	4,282	4,111	4,164
Operating Income	1,224	1,113	1,134
Other (Income) and Deductions
Interest expense	331	313	283
Interest income	(2)	(2)	0
Non-operating retirement benefits, net	(1)	(1)	0
Other income	(87)	(107)	(83)
Other expenses	96	56	77
Other (Income) and Deductions	337	259	277
Income Before Income Taxes	887	854	857
Income Tax Expense	109	138	193
Net Income Attributable to DTE Energy Company/DTE Electric Company	$ 778	$ 716	$ 664