Significant Accounting Policies (Details Textuals) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Significant Accounting Policies [Line Items]
Other income	$ 209,000,000	$ 196,000,000	$ 201,000,000
Receivables due date	21 days
Threshold period past due for write-off of trade accounts receivable	150 days
Specific review of probable future collections based on receivable balances in excess of 90 days	30 days
Unbilled revenues	$ 1,276,000,000	1,504,000,000
Regulatory liabilities	$ 610,000,000	820,000,000
Property maintenance accrual period	18 months
Amortization of Intangible Assets	$ 11,000,000	12,000,000	14,000,000
Excise and sales taxes net impact on statement of operations	0
Charitable contributions	12,000,000	25,000,000	18,000,000
Power and Industrial Projects
Significant Accounting Policies [Line Items]
Other income	83,000,000	78,000,000	81,000,000
Unbilled Revenues
Significant Accounting Policies [Line Items]
Unbilled revenues	620,000,000	773,000,000
DTE Electric
Significant Accounting Policies [Line Items]
Other income	60,000,000	62,000,000	$ 54,000,000
Unbilled revenues	657,000,000	688,000,000
Regulatory liabilities	218,000,000	395,000,000
DTE Electric | Unbilled Revenues
Significant Accounting Policies [Line Items]
Unbilled revenues	$ 237,000,000	250,000,000
Minimum
Significant Accounting Policies [Line Items]
Notes receivable considered delinquent period	60 days
Finite-lived intangible asset, useful life	1 year
Maximum
Significant Accounting Policies [Line Items]
Notes receivable considered delinquent period	120 days
Finite-lived intangible asset, useful life	26 years
Public Utilities, Inventory, Natural Gas
Significant Accounting Policies [Line Items]
LIFO inventory amount	$ 65,000,000	43,000,000
Excess of replacement costs over stated LIFO value	60,000,000	110,000,000
Fermi 2 refueling outage
Significant Accounting Policies [Line Items]
Regulatory liabilities	4,000,000	16,000,000
Fermi 2 refueling outage | DTE Electric
Significant Accounting Policies [Line Items]
Regulatory liabilities	$ 4,000,000	$ 16,000,000