Income Taxes (Reconciliation of Income Tax Expense to the Statutory Federal Income Tax Rate) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Entity Information [Line Items]
Statutory rate	21.00%	21.00%	35.00%
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income Before Income Taxes	$ 1,324	$ 1,216	$ 1,287
Income tax expense at statutory rate - 21% in 2019 and 2018 - 35% in 2017	278	255	450
Production tax credits	(128)	(223)	(189)
Investment tax credits	(4)	(4)	(4)
TCJA regulatory liability amortization	(38)	0	0
Depreciation	2	2	(4)
Noncontrolling interests	0	2	8
AFUDC equity	(4)	(14)	(18)
Employee Stock Ownership Plan dividends	(3)	(3)	(5)
Stock based compensation	(7)	(3)	(14)
State and local income taxes, net of federal benefit	48	60	51
Enactment of the Tax Cuts and Jobs Act	0	21	(105)
Other, net	8	5	5
Income Tax Expense	$ 152	$ 98	$ 175
Effective income tax rate	11.50%	8.10%	13.60%
DTE Electric
Entity Information [Line Items]
Statutory rate	21.00%	21.00%	35.00%
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income Before Income Taxes	$ 854	$ 857	$ 928
Income tax expense at statutory rate - 21% in 2019 and 2018 - 35% in 2017	179	180	325
Production tax credits	(45)	(35)	(36)
Investment tax credits	(4)	(3)	(4)
TCJA regulatory liability amortization	(35)	0	0
Depreciation	2	2	3
AFUDC equity	(4)	(3)	(5)
Employee Stock Ownership Plan dividends	(2)	(2)	(3)
State and local income taxes, net of federal benefit	49	49	48
Enactment of the Tax Cuts and Jobs Act	0	7	0
Other, net	(2)	(2)	(1)
Income Tax Expense	$ 138	$ 193	$ 327
Effective income tax rate	16.20%	22.50%	35.20%