Long-Term Debt (Debt Redemptions) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended
	Jun. 30, 2014	May 31, 2014 DTE Energy [Member] Senior Notes [Member]	Jun. 30, 2014 DTE Energy [Member] Long Term Debt, Other [Member]	Mar. 31, 2014 Electric [Member] Mortgages [Member]	Mar. 31, 2014 Electric [Member] Securitization Bonds [Member]	Jun. 30, 2014 Electric [Member] Tax Exempt Revenue Bonds [Member]	Apr. 30, 2014 Electric [Member] Tax Exempt Revenue Bonds [Member]	Jun. 30, 2014 Electric [Member] Tax-Exempt Revenue Bonds 1 [Member]	Apr. 30, 2014 Electric [Member] Tax-Exempt Revenue Bonds 1 [Member]	May 31, 2014 Gas [Member] Mortgages [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		7.625%			6.62%	4.875%	2.35%	6.00%	4.65%	8.25%
Extinguishment of Debt, Amount	$ 664	$ 300	$ 3	$ 13	$ 100	$ 36	$ 31	$ 69	$ 32	$ 80