Long-Term Debt (Details)	9 Months Ended
	Sep. 30, 2016 USD ($)
Debt Instrument [Line Items]
Debt issued	$ 600,000,000
Debt redeemed	$ 322,000,000
Mortgages | DTE Electric | May Mortgage Bonds 3.70%
Debt Instrument [Line Items]
Interest rate	3.70%
Debt issued	$ 300,000,000
Mortgages | DTE Electric | March Mortgage Bonds 7.904%
Debt Instrument [Line Items]
Interest rate	7.904%
Debt redeemed	$ 10,000,000
Junior Subordinated Debentures | May Junior Subordinated Debentures 5.375%
Debt Instrument [Line Items]
Interest rate	5.375%
Debt issued	$ 300,000,000
Senior Notes | June Senior Notes 6.35%
Debt Instrument [Line Items]
Interest rate	6.35%
Debt redeemed	$ 300,000,000
Other Long-Term Debt
Debt Instrument [Line Items]
Debt redeemed	$ 12,000,000