Long-Term Debt (Long Term Debt Outstanding and Weighted Average Interest Rates) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term Debt, Total	$ 8,094	$ 7,813
Long Term Debt excluding Securitization, Debentures and Capital Leases	7,312	6,854
Less Amount of Long-term Debt due within one year	(694)	(634)
Long-term Debt, Excluding Current Maturities	6,618	6,220
Long-term Securitization Bond	302	479
Less Amount of Securitization Bonds due within one year	(197)	(177)
Securitization bonds, Excluding Current Maturities	105	302
Junior Subordinated Notes, Noncurrent	480	480
Securitization Bonds [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	6.60%
Debt Instrument, Maturity Date	Mar. 15, 2015
Junior Subordinated Debentures [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	6.50%
Debt Instrument, Maturity Date	Dec. 01, 2061
Junior Subordinated Notes, Noncurrent	280	280
Junior Subordinated Debentures 1 [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	5.25%
Debt Instrument, Maturity Date	Dec. 01, 2062
Junior Subordinated Notes, Noncurrent	200	200
DTE Energy [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	6.10%
Debt Instrument, Maturity Date Range, Start	May 15, 2014
Debt Instrument, Maturity Date Range, End	Apr. 15, 2033
Long-term Debt, Total	1,297	1,298
DTE Electric [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	4.70%
Debt Instrument, Maturity Date Range, Start	Mar. 31, 2014
Debt Instrument, Maturity Date Range, End	Apr. 01, 2043
Long-term Debt, Total	4,286	3,777
DTE Electric [Member] | Tax Exempt Revenue Bonds [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	5.10%
Debt Instrument, Maturity Date Range, Start	Apr. 01, 2014
Debt Instrument, Maturity Date Range, End	Dec. 01, 2036
Long-term Debt, Total	558	707
DTE Gas [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	5.60%
Debt Instrument, Maturity Date Range, Start	May 01, 2014
Debt Instrument, Maturity Date Range, End	Dec. 15, 2042
Long-term Debt, Total	1,029	919
DTE Gas [Member] | Long Term Debt, Other [Member]
Debt Instrument [Line Items]
Long-term Debt, Total	$ 142	$ 153