Short-Term Credit Arrangements and Borrowings (Tables)

6 Months Ended

Jun. 30, 2013

Short-term Debt [Abstract]

Schedule of Short-term Debt [Table Text Block]

The availability under the facilities in place at June 30, 2013 is shown in the following table:

	DTE Energy		DTE Electric		DTE Gas		Total
	(In millions)
Unsecured letter of credit facility, expiring in May 2014	$	50	$	—	$	—	$	50
Unsecured letter of credit facility, expiring in August 2015	125		—		—		125
Unsecured revolving credit facility, expiring April 2018	1,200		300		300		1,800
Total credit facilities at June 30, 2013	1,375		300		300		1,975
Amounts outstanding at June 30, 2013:
Commercial paper issuances	101		96		19		216
Letters of credit	184		—		—		184
	285		96		19		400
Net availability at June 30, 2013	$	1,090	$	204	$	281	$	1,575