Income Taxes (Deferred Tax Assets (Liabilities)) (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Components of Deferred Tax Assets and Liabilities [Abstract]
Property, plant, and equipment	$ (3,755,000,000)	$ (3,462,000,000)
Regulatory assets and liabilities	(47,000,000)	(54,000,000)
Tax credit carry-forwards	1,161,000,000	1,178,000,000
Pension and benefits	300,000,000	311,000,000
Federal net operating loss carry-forward	276,000,000	117,000,000
State and local net operating loss carry-forwards	117,000,000	59,000,000
Investments in equity method investees	(465,000,000)	(216,000,000)
Other	138,000,000	125,000,000
Deferred tax liabilities, gross	(2,275,000,000)	(1,942,000,000)
Less valuation allowance	(40,000,000)	(33,000,000)
Deferred income tax liabilities	(2,315,000,000)	(1,975,000,000)
Deferred income tax assets	2,264,000,000	2,021,000,000
Deferred income tax liabilities	(4,579,000,000)	(3,996,000,000)
DTE Electric
Components of Deferred Tax Assets and Liabilities [Abstract]
Property, plant, and equipment	(2,956,000,000)	(2,840,000,000)
Regulatory assets and liabilities		(3,000,000)
Regulatory assets and liabilities	4,000,000
Tax credit carry-forwards	252,000,000	250,000,000
Pension and benefits	258,000,000	258,000,000
Federal net operating loss carry-forward	0	2,000,000
State and local net operating loss carry-forwards	0	1,000,000
Investments in equity method investees	0	(1,000,000)
Other	87,000,000	87,000,000
Deferred tax liabilities, gross	(2,355,000,000)	(2,246,000,000)
Less valuation allowance	0	0
Deferred income tax liabilities	(2,355,000,000)	(2,246,000,000)
Deferred income tax assets	865,000,000	855,000,000
Deferred income tax liabilities	$ (3,220,000,000)	$ (3,101,000,000)