Significant Accounting Policies (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Significant Accounting Policies [Line Items]
Specific review of probable future collections based on receivable balances in excess of 90 days	30 days
Unbilled revenues	$ 1,758,000,000	$ 1,522,000,000
Regulatory liabilities	$ 2,893,000,000	589,000,000
Property maintenance accrual period	18 months
Amortization of intangible assets	$ 29,000,000	16,000,000	$ 11,000,000
Excise and sales taxes net impact on statement of operations	0
Charitable contributions	43,000,000	26,000,000	$ 12,000,000
Fermi 2 refueling outage
Significant Accounting Policies [Line Items]
Regulatory liabilities	15,000,000	27,000,000
Natural gas inventory
Significant Accounting Policies [Line Items]
LIFO inventory amount	29,000,000	45,000,000
Excess of replacement costs over stated LIFO value	$ 81,000,000	132,000,000
Minimum
Significant Accounting Policies [Line Items]
Notes receivable considered delinquent period	60 days
Maximum
Significant Accounting Policies [Line Items]
Notes receivable considered delinquent period	120 days
DTE Electric and DTE Gas
Significant Accounting Policies [Line Items]
Receivables due date	21 days
Threshold period past due for write-off of trade accounts receivable	150 days
DTE Electric
Significant Accounting Policies [Line Items]
Unbilled revenues	$ 791,000,000	728,000,000
Regulatory liabilities	2,154,000,000	256,000,000
DTE Electric | Fermi 2 refueling outage
Significant Accounting Policies [Line Items]
Regulatory liabilities	15,000,000	27,000,000
Unbilled revenues
Significant Accounting Policies [Line Items]
Unbilled revenues	1,000,000,000	814,000,000
Unbilled revenues | DTE Electric
Significant Accounting Policies [Line Items]
Unbilled revenues	$ 290,000,000	$ 267,000,000