Short-Term Credit Arrangements and Borrowings (Tables)

6 Months Ended

Jun. 30, 2014

Short-term Debt [Abstract]

Schedule of Line of Credit Facilities [Table Text Block]

The availability under the facilities in place at June 30, 2014 is shown in the following table:

	DTE Energy		DTE Electric		DTE Gas		Total
	(In millions)
Unsecured letter of credit facility, expiring in February 2015	$	100	$	—	$	—	$	100
Unsecured letter of credit facility, expiring in August 2015	125		—		—		125
Unsecured revolving credit facility, expiring April 2018	1,200		300		300		1,800
	1,425		300		300		2,025
Amounts outstanding at June 30, 2014:
Commercial paper issuances	236		275		—		511
Letters of credit	208		—		—		208
	444		275		—		719
Net availability at June 30, 2014	$	981	$	25	$	300	$	1,306