Income Taxes (Reconciliation of Income Tax Expense to the Statutory Federal Income Tax Rate) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Entity Information [Line Items]
Effective income tax rate reconciliation, at federal statutory income tax rate, percent	35.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income Before Income Taxes	$ 1,105	$ 950	$ 1,275
Income tax expense at 35% statutory rate	387	333	446
Production tax credits	(145)	(122)	(119)
Investment tax credits	(5)	(7)	(6)
Depreciation	(4)	(4)	(4)
Noncontrolling Interests	12	2	(2)
AFUDC Equity	(10)	(8)	(7)
Employee Stock Ownership Plan dividends	(5)	(5)	(4)
Subsidiary stock loss	(10)	0	0
State and local income taxes, net of federal benefit	58	35	51
Enactment of New York Corporate Income Tax Legislation, net of federal benefit	0	0	8
Other, net	(7)	6	1
Income tax expense	$ 271	$ 230	$ 364
Effective income tax rate (as percent)	24.50%	24.20%	28.50%
DTE Electric
Entity Information [Line Items]
Effective income tax rate reconciliation, at federal statutory income tax rate, percent	35.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income Before Income Taxes	$ 975	$ 836	$ 830
Income tax expense at 35% statutory rate	341	293	291
Production tax credits	(30)	(31)	(22)
Investment tax credits	(4)	(5)	(5)
Depreciation	3	3	3
AFUDC Equity	(6)	(7)	(7)
Employee Stock Ownership Plan dividends	(3)	(3)	(3)
Domestic production activities deduction	0	0	(2)
State and local income taxes, net of federal benefit	56	43	43
Other, net	(4)	(1)	0
Income tax expense	$ 353	$ 292	$ 298
Effective income tax rate (as percent)	36.20%	34.90%	35.90%